# Analysis of the Herschel/Hexos Spectral Survey Toward Orion South: A Massive Protostellar Envelope with Strong External Irradiation

K. Tahani, R. Plume, E. A. Bergin, V. Tolls, T. G. Phillips, E. Caux, S.

Cabrit, J. R. Goicoechea, P. F. Goldsmith, D. Johnstone, et al.

► To cite this version:

K. Tahani, R. Plume, E. A. Bergin, V. Tolls, T. G. Phillips, et al. Analysis of the Herschel/Hexos Spectral Survey Toward Orion South: A Massive Protostellar Envelope with Strong External Irradiation. The Astrophysical Journal, 2016, 832, 10.3847/0004-637X/832/1/12. insu-03669405

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https://insu.hal.science/insu-03669405v1

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ANALYSIS OF THE *HERSCHEL*/HEXOS SPECTRAL SURVEY TOWARD ORION SOUTH: A MASSIVE PROTOSTELLAR ENVELOPE WITH STRONG EXTERNAL IRRADIATION

K. TAHANI<fnref n="1" />, R. PLUME<fnref n="1" />, E. A. BERGIN<fnref n="2" />, V. TOLLS<fnref n="3" />, T. G. PHILLIPS<fnref n="4" />, E. CAUX<fnref n="5" />,<fnref n="6" />, S. CABRIT<fnref n="7" />, J. R. GOICOECHEA<fnref n="8" />, P. F. GOLDSMITH<fnref n="9" />, D. JOHNSTONE<fnref n="10" />, D. C. LIS<fnref n="4" />,<fnref n="7" />, L. PAGANI<fnref n="7" />, K. M. MENTEN<fnref n="11" />, H. S. P. MÜLLER<fnref n="12" />, V. OSSENKOPF-OKADA<fnref n="12" />, J. C. PEARSON<fnref n="9" />, AND F. F. S. VAN DER TAK<fnref n="13" />,<fnref n="14" />

*Received 2016 May 30; revised 2016 August 8; accepted 2016 August 16; published 2016 November 11*

ABSTRACT

We present results from a comprehensive submillimeter spectral survey toward the source Orion South, based on data obtained with the Heterodyne Instrument for the Far-Infrared instrument on board the *Herschel Space Observatory*, covering the frequency range of 480 to 1900 GHz. We detect 685 spectral lines with signal-to-noise ratios (S/Ns) > 3σ, originating from 52 different molecular and atomic species. We model each of the detected species assuming conditions of Local Thermodynamic Equilibrium. This analysis provides an estimate of the physical conditions of Orion South (column density, temperature, source size, and $V_{LSR}$). We find evidence for three different cloud components: a cool ($T_{ex}$ ~ 20–40 K), spatially extended (>60"), and quiescent ($\Delta V_{FWHM}$ ~ 4 km s⁻<fnref n="1" />) component; a warmer ($T_{ex}$ ~ 80–100 K), less spatially extended (~30"), and dynamic ($\Delta V_{FWHM}$ ~ 8 km s⁻<fnref n="1" />) component, which is likely affected by embedded outflows; and a kinematically distinct region ($T_{ex}$ > 100 K; $V_{LSR}$ ~ 8 km s⁻<fnref n="1" />), dominated by emission from species that trace ultraviolet irradiation, likely at the surface of the cloud. We find little evidence for the existence of a chemically distinct “hot-core” component, likely due to the small filling factor of the hot core or hot cores within the *Herschel* beam. We find that the chemical composition of the gas in the cooler, quiescent component of Orion South more closely resembles that of the quiescent ridge in Orion-KL. The gas in the warmer, dynamic component, however, more closely resembles that of the Compact Ridge and Plateau regions of Orion-KL, suggesting that higher temperatures and shocks also have an influence on the overall chemistry of Orion South.

**Key words:** ISM: abundances – ISM: individual objects (Orion South) – ISM: kinematics and dynamics – ISM: lines and bands – ISM: molecules

1. INTRODUCTION

To date, about 200 different molecular species have been detected in the interstellar medium (Menten & Wyrowski 2011).<fnref n="15" /> However, our understanding of the total molecular inventory of individual sources is poor, since few sources have been systematically surveyed in any frequency band due to the large amount of observing time required to perform unbiased spectral surveys (e.g., Blake et al. 1987; Schilke et al. 1997a, 2001; Nummelin et al. 1998; Comito et al. 2005; Furlan et al. 2006; Tercero et al. 2010; Neill et al. 2014). Therefore, we do not truly understand the origin of the chemical complexity observed in interstellar space. Understanding this complexity is important to comprehend details of the formation of stars, planets, and life.

Regardless of how complex chemistry arises in interstellar space, the chemical composition (and subsequent chemical

evolution) can, in turn, affect the physical conditions (and subsequent dynamical evolution) of a star-forming region (e.g., see Garrod & Herbst 2006; Garrod et al. 2008; Herbst & van Dishoeck 2009). For example, the overall molecular (and to some degree atomic) content can play an important role in regulating the gas pressure by changing the temperature of the gas via the process of heating and cooling through line-absorption and emission (Goldsmith & Langer 1978; Ceccarelli et al. 1996). In addition, molecular ions can affect the strength of coupling between the gas and the magnetic fields (which is related to magnetic turbulent support, e.g., Williams et al. 1998). Thus, there is a complex feedback between the physical and chemical conditions in an interstellar gas cloud that either helps drive the star-formation process, or hinders it, and which may help determine the masses of the newly formed stars.

In order to understand the origin of chemical complexity in interstellar space and how this chemistry evolves and affects the process of star formation in the universe (as well as the formation of planets and pre-biotic chemical species), we

<footnote n="1">¹Department of Physics & Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada; ktahani@ucalgary.ca</footnote>

<footnote n="2">²Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USA</footnote>

<footnote n="3">³Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA</footnote>

<footnote n="4">⁴California Institute of Technology, Cahill Center for Astronomy and Astrophysics 301-17, Pasadena, CA 91125, USA</footnote>

<footnote n="5">⁵Université de Toulouse, UPS-OMP, IRAP, F-31028 Toulouse, France</footnote>

<footnote n="6">⁶CNRS, IRAP, 9 Av. Colonel Roche, BP 44346, F-31028 Toulouse Cedex 4, France</footnote>

<footnote n="7">⁷LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, F-75014, Paris, France</footnote>

<footnote n="8">⁸Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC). Sor Juana Ines de la Cruz 3, E-28049 Cantoblanco, Madrid, Spain</footnote>

<footnote n="9">⁹Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, USA</footnote>

<footnote n="10">¹⁰National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada</footnote>

<footnote n="11">¹¹Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany</footnote>

<footnote n="12">¹²I. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany</footnote>

<footnote n="13">¹³SRON Netherlands Institute for Space Research, P.O. Box 800, 9700 AV, Groningen, The Netherlands</footnote>

<footnote n="14">¹⁴Kapteyn Astronomical Institute, Groningen, The Netherlands</footnote>

<footnote n="15">¹⁵Also see http://www.astro.uni-koeln.de/cdms/molecules and http://www.astrochymist.org/astrochymist_ism.html.</footnote>
require unbiased and complete surveys of spectral lines that
span a broad range of wavelengths. These types of data sets are
needed so that we can sample a wide variety of molecular and
atomic species, as well as obtain multiple emission lines from
each of the species, in order to extract the physical conditions
in the gas. Fortunately, with the advent of sensitive, high-
resolution spectrometers for millimeter/submillimeter wave-
lengths, especially those developed for space-based observa-
tories, it is now possible to obtain such surveys and to begin to
address these issues (e.g., Zernickel et al. 2012; Kama et al.
2013; Crockett et al. 2014; Kaźmierczak-Barthel et al. 2015).

The key project Herschel observations of EXtraOrdinary
Sources (HEXOS; Bergin et al. 2010) was designed to address
issues related to the chemical composition of massive star-
forming regions. HEXOS has obtained spectral line surveys of
the Orion-KL, Orion South (hereafter Orion-S), and Orion Bar
(Z. Nagy et al. 2016, in preparation) regions within the Orion A
Molecular Cloud, at high frequencies that are not easily
accessible from ground-based observatories (480–1900 GHz).
Both Orion-KL and Orion-S are relatively nearby (420 pc;
Menten et al. 2007) massive star-forming regions close to the
Orion Nebula. The nearby Trapezium OB stars are the source
of high energy photons, which produce Photon Dominated
Regions (PDRs) throughout the region. The UV flux
(6 < *E* < 13.6 eV) in the vicinity of Orion-S is
χ = 1.1 × 10⁵χ₀ (Herrmann et al. 1997; Goicoechea
et al. 2015), where χ₀ = 2.7 × 10⁻⁴ erg s⁻¹ cm⁻² sr⁻¹ (Draine
& Bertoldi 1996). Observations of Goicoechea et al. (2015) and
O’Dell & Harris (2010) suggest that the H II region lies mostly
in front of the molecular material, but may wrap behind, at least
part of, the Orion-S molecular cloud. Thus at least some of the
Orion-S molecular gas is located in front of ionized material
has been convincingly demonstrated by Very Large Array
absorption measurements of the H₂CO 6 cm 1₁₀–1₁₁ transition
(Mangum et al. 1993).

Despite the fact that the far-infrared luminosity of Orion-S
(8.5 × 10³ L☉; Mezger et al. 1990) is more than an order of
magnitude below that of KL, a number of energetic outflows
associated with Orion-S suggest ongoing star formation. For
example, CO *J* = 2–1 SMA observations (Zapata et al. 2005)
revealed a highly collimated bipolar outflow extending ~30″
over the velocity range ~−80 to ~−26 km s⁻¹ and ~22 to
~82 km s⁻¹ oriented NW–SE. The submillimeter continuum
source with a deconvolved size ≲0.′′6 and an integrated flux of
116.2 ± 9.0 mJy at 1.3 mm is well centered on the bipolar
outflow axis, α₂₀₀ = 05h35m13s.550, δ₂₀₀ = −05°23′59″.14.
In addition, another quite extended, collimated, low-velocity
(5 km s⁻¹) CO outflow has been observed, oriented NE–SW
(Schmid-Burgk et al. 1990), and a low-velocity (10 km s⁻¹)
bipolar SiO (5–4) outflow with a length of ~30″ (oriented NE–
SW) has been reported by Ziurys et al. (1990). Four other SiO
outflows are also listed by Zapata et al. (2006).

Despite the presence of star-formation activity, as indicated
by the IR luminosity and molecular outflows, BIMA observa-
tions of a few selected species by McMullin et al. (1993)
suggest that the chemistry of Orion-S resembles that of the
Orion-KL quiescent ridge and has fewer, narrower, and weaker
lines than KL. These observations may imply that Orion-S is a
more quiescent and younger star-forming region in which the
star formation activity has not had time to significantly alter the
dynamics and chemistry of the region. This idea is also
consistent with dynamical ages from outflow observations in

Orion-S (i.e., Schmid-Burgk et al. 1990; Bally et al. 2000;
Zapata et al. 2005). Assuming no projection effects, the
maximum corresponding dynamical age for the largest outflow
is found to be less than 45,000 years, which is still remarkably
young (Schmid-Burgk et al. 1990). The dynamical age for all
the other outflows can be shown to be less than 5000 years
(Bally et al. 2000; Zapata et al. 2005). A more detailed
comparison between Orion-S and Orion-KL is, therefore, of
great interest, since the two regions presumably formed under
similar conditions, but could have very different chemical
abundances, possibly based on differences in their ages,
densities, temperatures, radiation fields, etc.

In this paper, we present a comprehensive study of the
Herschel/Heterodyne Instrument for the Far-Infrared (HIFI)
spectral survey toward Orion-S. The observations presented
here were obtained as part of HEXOS and span over 1.2 THz of
frequencies, mostly not accessible from the ground. In
Section 2, we present our observations and data reduction
methods, including the removal of off-position contamination,
line identification, and Gaussian fitting of the spectral features.
Our results (including LTE modeling of each individual
species) together with a chemical comparison of Orion-S are
presented in Section 3. The conclusions are provided in
Section 4.

## 2. OBSERVATIONS AND DATA REDUCTION

The data presented in this paper were taken with HIFI (de
Graauw et al. 2010), one of three instruments on board the
Herschel Space Observatory (Pilbratt et al. 2010). HIFI
operated over the frequency range of 480–1900 GHz (with
two gaps: one at 1280–1430 GHz, due to the switch between
SIS and HEB detectors (Roelfsema et al. 2012), and one at
1540–1570 GHz, which was an observational time saving
strategy since this frequency range was expected to have few
transitions). HIFI was separated into 14 different bands (1a, 1b,
..., 7b). Each receiver band had independent channels for
horizontal (H) and vertical (V) polarizations, each with its
dedicated Wide Band Spectrometer (WBS) having a native
spectral resolution of 1.1 MHz (Roelfsema et al. 2012). Bands
1–5 were observed with an LO redundancy of 6, whereas
Bands 6 and 7 used a redundancy of 2. Redundancy refers to
the number of observations of each sky frequency with
different LO settings. For example, a redundancy of 6 means
that each frequency in the band was observed with 6 different
LO settings. This redundancy was necessary in order to
distinguish lines originating from the upper and the lower
sidebands (Comito & Schilke 2002). A redundancy of 2 was
sufficient for bands 6 and 7 due to the relatively lower density
of transitions at these high frequencies. The central position of
Orion-S was α₂₀₀ = 5h35m13s.44, δ₂₀₀ = −5°24′08″.1. All
observations were taken in Dual Beam Switch (DBS) mode
using the Fast Chop option (>0.5 Hz chop frequency).

We used the hifiPipeline task in HIPE 9.0 for all data
reduction. The hifiPipeline task is a pre-compiled script in
HIPE used to process level 0 data to any higher level (e.g., 0.5,
1.0, etc.). See Ott (2010) for a description of the various data
products. Spurious spectral features were removed and fully
calibrated, double side band (DSB) spectra were deconvolved
into single side band spectra (e.g., level 2.5). Additional details
on data reduction and observational parameters can be found in
Bergin et al. (2010) and Crockett et al. (2010). After processing
by HIPE 9.0, the H and V polarizations were co-added (except
<table><caption>**Table 1**
Data Smoothing and Noise Characteristics</caption><thead><tr><th></th><th>Smoothing Channels</th><th>Freq. Res. (MHz)</th><th>Vel. Res. (km s<sup>-1</sup>)</th><th>T<sub>sys</sub> (K)</th><th>1σ rms (K)</th></tr></thead><tbody><tr><td>Band 1</td><td>2</td><td>2.2</td><td>1.0–1.4</td><td>~100</td><td>~0.02–0.05</td></tr><tr><td>Band 2</td><td>4</td><td>4.4</td><td>1.6–2.1</td><td>~150</td><td>~0.03–0.07</td></tr><tr><td>Band 3</td><td>4</td><td>4.4</td><td>1.4–1.7</td><td>~200</td><td>~0.04–0.09</td></tr><tr><td>Band 4</td><td>8</td><td>8.8</td><td>2.4–2.8</td><td>~400</td><td>~0.1–0.2</td></tr><tr><td>Band 5</td><td>8</td><td>8.8</td><td>2.1–2.4</td><td>~1000</td><td>~0.1–0.3</td></tr><tr><td>Band 6</td><td>16</td><td>17.6</td><td>3.1–3.7</td><td>~1300</td><td>~0.3–2.0</td></tr><tr><td>Band 7</td><td>16</td><td>17.6</td><td>2.8–3.1</td><td>~1300</td><td>~0.4–4.0</td></tr></tbody></table>

for Band 4a, which, due to processing errors specific to this band, had much noisier V polarization data that were excluded) and then the spectra were Hanning smoothed by 2 to 16 channels (see Table 1) to improve the signal-to-noise ratio. Results are provided in Table 1, which shows typical values for the 1σ rms noise, system temperature, velocity, and frequency resolutions after smoothing, and the number of channels smoothed for each band. The 1σ rms noise is calculated from line-free regions of the spectrum immediately adjacent to the lines. A noise range is provided since the noise is not uniform across the bands.

All of the data in this paper are presented on the $T_A$ temperature scale and, for subsequent analyses, were converted to $T_{mb}$ using the main beam efficiencies in Müller et al. (2014).<fnref n="16" /> The final data after deconvolution and spectral smoothing (bands 1a–7b) are shown in Figures 1–4, in which the $T_A$ range is in Kelvin and frequency is in MHz. The strongest lines are labeled in each band, and in order to make the residual noise recognizable and comparable from one band to another the intensity is fixed to 15 K for all bands. Note that certain broad features, like the one near 790 GHz, are most likely due to excess noise, since individual observations show quite a few noise spikes in these spectral ranges.

## 2.1. Removal of Off-position Contamination

As described in the previous section, the HEXOS Orion-S spectral survey was observed in DBS mode. Since the observations used the chopper in this mode, the reference positions were fixed to ~3 arcmin from the target position, with an angle set by observatory constraint. In a crowded field like the Orion Molecular Cloud region, it is very likely that the reference position is not free of emission or absorption for some or all of the molecular lines detected. Typically, emission (absorption) in the reference position appears as an absorption- (emission-)like feature in the final spectrum. Since the case of absorption in the reference beam is rare, due to a low continuum flux, we will consider only emission. Figure 5 provides an image of the dust emission at a wavelength of 250 µm obtained with the Herschel/SPIRE instrument. The positions of the Orion-S observations and the two reference observations for each of the 14 HIFI bands are overlaid. The diameters of the circles shown represent the FWHM of the individual beams for the center frequencies of each HIFI band. It is apparent that a few of the reference observations (on the east side) were located near the Orion Bar region, making reference beam line contamination very likely. In addition, we

<figure><img src="image_3.png" /><figcaption>**Figure 1.** HEXOS/HIFI spectral scans of (from top to bottom) band 1a, band 1b, band 2a, and band 2b after Hanning smoothing. Resolutions, noise levels, and smoothing factors for each band are listed in Table 1. Baselines are not subtracted and some of the strongest lines are labelled.</figcaption></figure>

<figure><img src="image_4.png" /><figcaption>**Figure 2.** Same as Figure 1 except for band 3a, band 3b, band 4a, and band 4b.</figcaption></figure>

even captured emission in the lower-$J$ $^{12}$CO transitions in the opposite chopping direction.

The identification of potentially contaminated lines was first performed after the deconvolution by checking the line profile

<footnote n="16">¹⁶ http://herschel.esac.esa.int/twiki/bin/view/Public/HifiCalibrationWeb#HIFI_performance_andCalibration</footnote>
<figure><img src="image_5.png" /><figcaption>**Figure 3.** Same as Figure 1 except for band 5a, band 5b, band 6a, and band 6b. The higher noise level in band 6 is due to the HEB mixers, which produce higher noise in comparison with the SIS mixers used in the first five bands.</figcaption></figure>

<figure><img src="image_6.png" /><figcaption>**Figure 4.** Same as Figure 1 except for band 7a and band 7b. The higher noise level in band 7 is due to the HEB mixers, which produce higher noise in comparison with the SIS mixers used in the first five bands.</figcaption></figure>

of the detected lines. Once lines were identified, we performed additional tests by subtracting the Level 0.5 nod2 reference spectrum from the associated nod1 reference spectrum of the scans that cover the frequency ranges of these lines. If the resulting spectrum showed only noise, we assumed no emission in the reference spectra (we never experienced the case that emission in both reference beams cancelled out perfectly, which would hide this problem). If the resulting spectrum showed an emission line, there was emission in the nod1 reference beam; and if the spectrum showed an absorption feature, there was emission in the nod2 reference beam.

In order to remove the emission in the reference beams, we used the Herschel/HIPE hifiPipeline task to create the Level 0.5 product, in which the reference observations are still separated from the target observations. A custom HIPE script

<figure><img src="image_7.png" /><figcaption>**Figure 5.** HEXOS Orion-S Observations: the circles indicate the beam positions with diameters corresponding to the FWHM at the center frequency of the HIFI bands. Circles near the center of the image (at 1 ~ 83.81°) indicate the position of the spectral scan observations of Orion-S. Circles to the left and to the right (at 1 ~ 83.86 and 83.76 respectively) indicate the off-position observations. The background shows the Herschel/SPIRE 250 µm dust emission in the Orion-KL region (white regions indicate saturated pixels). From the location of the beam circles near the Orion Bar, it is apparent that some of the observations see emission in at least one reference beam.</figcaption></figure>

then extracted all affected reference scans and the neighboring scans taken before and after the affected scans that have slightly changed LO settings such that the contaminating emission is at sufficiently different intermediate frequencies (IF). The repair is based on the assumption that the bandpass of all observations changes only very little with small changes in the LO-setting. The primary change is in the amplitude, while the shape of the bandpass changes negligibly. Thus, we could use the neighboring reference scans to repair the contaminated reference flux.

The first step of the repair was to determine the IF-frequency interval $[f_I, f_H]$, covering the reference beam emission and two smaller, abutting intervals $[f_I - \Delta_I, f_I]$ and $[f_H, f_H + \Delta_H]$, indicated by the green areas in Figure 6, for scaling. The next step included extracting and averaging the flux of the neighboring scans over the frequency range $[f_I - \Delta_I, f_H + \Delta_H]$ (Ref 1 and Ref 2 in Figure 6). Then, to properly scale the averaged flux to replace the contaminated flux, we determined the ratios of the original reference flux to the averaged flux over the two green intervals, interpolated the corresponding values over the interval containing the contaminated flux (the white area in Figure 6), and calculated the new reference flux by multiplying the averaged flux with the just determined ratio over the entire frequency range $[f_I - \Delta_I, f_H + \Delta_H]$. This new reference flux (New Ref) now replaced the original reference flux (Orig Ref). From here on, we continued to use the Herschel/HIPE hifiPipeline task to create the Level 1.0 and higher products.

The lines that needed repairs are B1a ([C I]), B2b (H₂S, C¹⁸O, C¹³CO, C¹⁷O), B3a (CO, [C I], CH⁺), B3b (C¹⁸O, C¹³CO, C¹⁷O, CO), B4b (H₂S, C¹⁸O, C¹³CO), B5a (C¹⁷O, CO, C¹⁸O, C¹³CO), B7a (CO), and B7b (CO, [C II]). Figure 7 shows an example of how the repair recovered the true line profile of the [C II] 158 µm line.
<figure><img src="image_8.png" /><figcaption>**Figure 6.** Removing the reference beam emission in the HEXOS Orion-S spectral scan: the blue solid line shows the emission in a reference beam. The red dashed and the green dotted lines show the references for an earlier scan and a later scan with slightly changed LO settings, but covering the same IF interval. Averaging and scaling these reference scans using just the frequency ranges marked with green background results in the new reference spectrum, which replaces the old reference spectrum only in the frequency range shown (the total spectrum is still 4 GHz wide or ~1 GHz for each of the 4 HIFI WBS sub-bands). For display purposes, we subtracted the new reference from all scans, causing it to appear as a straight line.</figcaption></figure>

<figure><img src="image_9.png" /><figcaption>**Figure 7.** Example of the repaired [C II] line at 1900.526 GHz. The red dashed line shows the original result with emission in both reference beams and the blue solid line shows the result with the emission in the reference beams removed.</figcaption></figure>

## 2.2. Line Identification

We used CASSIS,<fnref n="17" /> a Java based software package designed to analyze astrophysical spectroscopic data to perform the line identification and modeling. Our line identification procedure involved two main steps. First, we visually identified the strongest (well above 5σ signal-to-noise) and best known emission lines in the spectrum (e.g., from CO, CS, HCO+, HCN, H₂O, etc.) and some of their isotopologues utilizing the

JPL<fnref n="18" /> (Pearson et al. 2005) and CDMS<fnref n="19" /> (Müller et al. 2005) spectral line databases. These databases include tabulated values of the central frequency error for each transition. Although, in some cases, the difference between the listed centroid frequency of a particular transition from these two catalogs is larger than their given error bars, the observed line width of the transition usually compensates for this ambiguity and makes the identification robust. Many of the strongest identified species are shown in Figures 1–4. In these cases, line blending (e.g., the appearance of more than one transition/species at a single frequency) is not considered a problem since the emission from the well-known species will invariably overwhelm the weak emission from a less well-known and, presumably, lower abundance blended line.

Once the strongest emission lines were accounted for, we examined all other spectral lines in our data that had a signal-to-noise ratio (S/N) above 3σ (in peak intensity). We first performed the line identification via visual inspection of each spectral feature in each HIFI band and compared the transition's frequency to those listed in the databases. From the possible database entries, we investigated all species with transitions that fell within a Doppler velocity range of 5.5 to 8.5 km s⁻¹ (i.e., within ±1.5 km s⁻¹ of the assumed central velocity of Orion-S). Within this velocity range, we examined a smaller sub-sample of possible spectral lines with upper state excitation energies (E<sub>up</sub>) less than 1500 K. If a single database entry from this sub-sample matched the observed spectral feature, we considered this to be a tentative identification. In order to confirm or reject this tentative identification, we then searched for other predicted transitions of the selected species in all of the HIFI bands. If we saw other spectral features in the data that matched the predicted frequencies, we accepted the initial line identification as being likely correct. If we did not, then the initial line identification was still considered to be only tentative, since we realize that the absence of other predicted transitions may be due to special excitation conditions. Therefore, in both cases, in order to finally confirm or reject our initial line identifications, Local Thermodynamic Equilibrium (LTE) modeling was performed (described in detail in Section 3), which allowed us to determine if all the observed spectral features from the tentatively detected species could be theoretically reproduced under uniform excitation conditions.

Our LTE models explored excitation conditions with T<sub>ex</sub> ≤ 1500 K (where T<sub>ex</sub> is the excitation temperature—equal to the kinetic temperature in LTE), E<sub>up</sub> ≤ 1500 K, and total species column density ≤10¹⁷ cm⁻². If the LTE model produced emission at the frequency of the spectral feature, then the line identification was considered confirmed. If not, the species was assumed to have been incorrectly identified and a new identification for that spectral feature was sought. Note, at this stage, we are simply trying to produce some visible model emission at the frequency of the spectral feature and not trying to fit or replicate the observed spectral line profile. This will be performed in a subsequent stage described in Section 3.1. If a spectral feature could not be reproduced by an LTE model of any species, or if there was no database entry at the frequency of the observed spectral feature, that feature was listed as an unidentified line (32 lines in total). Visual inspection of the original, DSB spectra indicates that all of these features are “ghosts” (i.e., artifacts of the deconvolution routine). A list of

<footnote n="17">¹⁷ CASSIS was developed by IRAP-UPS/CNRS. See http://cassis.irap.omp.eu</footnote>

<footnote n="18">¹⁸ http://spec.jpl.nasa.gov/ftp/pub/catalog/doc/catintro.pdf</footnote>

<footnote n="19">¹⁹ http://www.astro.uni-koeln.de/cdms/catalog</footnote>
<table><caption>**Table 2**
Identified Species in Orion-S</caption><thead><tr><th>Atoms</th><th>Di-atomic<br>Molecules</th><th>Multi-atomic<br>Molecules</th><th>Ionized Species</th></tr></thead><tbody><tr><td rowspan="24">C-atom</td><td>CO</td><td>CCH</td><td>C<sup>+</sup></td></tr><tr><td><sup>13</sup>CO</td><td>DCN</td><td>CH<sup>+</sup></td></tr><tr><td><sup>13</sup>C<sup>18</sup>O</td><td>HNC</td><td>CO<sup>+</sup></td></tr><tr><td>C<sup>18</sup>O</td><td>HCN</td><td>DCO<sup>+</sup></td></tr><tr><td>C<sup>17</sup>O</td><td>H<sup>13</sup>CN</td><td>H<sup>13</sup>CO<sup>+</sup></td></tr><tr><td>CS</td><td>HC<sup>15</sup>N</td><td>HC<sup>18</sup>O<sup>+</sup></td></tr><tr><td><sup>13</sup>CS</td><td>HDO<sup>a</sup></td><td>HCO<sup>+</sup></td></tr><tr><td>C<sup>34</sup>S</td><td>o-H<sub>2</sub>O</td><td>HCS<sup>+</sup></td></tr><tr><td>CH</td><td>p-H<sub>2</sub>O</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>CN</td><td>o-H<sub>2</sub><sup>18</sup>O<sup>a</sup></td><td>SH<sup>+</sup></td></tr><tr><td>HCl<sup>a</sup></td><td>p-H<sub>2</sub><sup>18</sup>O<sup>a</sup></td><td>...</td></tr><tr><td>H<sup>37</sup>Cl<sup>a</sup></td><td>o-H<sub>2</sub>S</td><td>...</td></tr><tr><td>HF<sup>a</sup></td><td>p-H<sub>2</sub>S</td><td>...</td></tr><tr><td>NO<sup>a</sup></td><td>H<sup>33</sup>S</td><td>...</td></tr><tr><td>SiO</td><td>H<sup>34</sup>S</td><td>...</td></tr><tr><td>SO</td><td>H<sub>2</sub>CS</td><td>...</td></tr><tr><td>...</td><td>o-H<sub>2</sub>CO</td><td>...</td></tr><tr><td>...</td><td>p-H<sub>2</sub>CO</td><td>...</td></tr><tr><td>...</td><td>o-NH<sub>3</sub></td><td>...</td></tr><tr><td>...</td><td>p-NH<sub>3</sub></td><td>...</td></tr><tr><td>...</td><td>A-CH<sub>3</sub>OH</td><td>...</td></tr><tr><td>...</td><td>E-CH<sub>3</sub>OH</td><td>...</td></tr><tr><td>...</td><td>CH<sub>3</sub>OCH<sub>3</sub></td><td>...</td></tr><tr><td>...</td><td>NH<sub>2</sub></td><td>...</td></tr><tr><td>...</td><td>SO<sub>2</sub></td><td>...</td></tr></tbody></table>

**Note.**

all identified species is given in Table 2. A frequency ordered list of all spectral features above $3\sigma$ in intensity (as well as their peak intensity) is given in Table 3. Ghost lines are identified as “ghost.” In total, we identified 52 different species (including isotopologues), which are responsible for 685 transitions (including the blended lines) in the HIFI spectra. It is, of course, possible that additional species and transitions exist in Orion-S, but at intensities too weak to be detected. This will be addressed in Section 3.3.2.

In some cases, our LTE modeling resulted in a particular spectral feature being reasonably explained by a superposition of lines from more than one species/transition (i.e., blended lines). In order to account for the possible effects of line blending, we performed modeling of all transitions of the two species in all HIFI bands. After obtaining good fits to the unblended transitions, we were able to determine how much each species contributed to the blended feature. An example of a blended line is shown in Figure 8, in which the data are shown by the black histogram, the solid red line indicates a $C^{17}O$ transition, the solid blue line indicates an $H_2CO$ transition and the solid green line is the superposition of these two model results. Note that the solid green line in Figure 8 does not represent a multicomponent Gaussian fit but rather the LTE modeling required to reproduce the line profiles (see Section 3.1). Given the relatively few spectral lines in Orion-S, significant blending was only a problem in 6 of 685 lines detected. These blended lines are indicated by a “b” superscript in Tables 3 and 4. In Table 3, both species are listed. Blended

<table><caption>**Table 3**
All Observed Lines above the $3\sigma$ Noise Level in Order of Increasing Frequency</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td colspan="3">Band 1a</td></tr><tr><td>480.2699</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>481.5056</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>481.9167</td><td>0.3</td><td>C<sup>34</sup>S</td></tr><tr><td>482.2179</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>482.2833</td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>482.9598</td><td>1.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>483.0808</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>483.1418</td><td>1.7</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>483.3898</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>483.3983</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>483.4623</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>483.4728</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>483.5393</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>483.5533</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>483.5668</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>483.5818</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>483.6868</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>483.7633</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>484.0058</td><td>0.8</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>484.0238</td><td>0.7</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>484.0718</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>484.2703</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>485.2638</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>486.9419</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>487.5319</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>487.6639</td><td>0.2</td><td>H<sub>2</sub>CS</td></tr><tr><td>489.0379</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>489.7509</td><td>4.5</td><td>CS</td></tr><tr><td>490.5970</td><td>0.2</td><td>HDO</td></tr><tr><td>491.5520</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>491.9335</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>491.9690</td><td>3.1</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>492.1615</td><td>4.7</td><td>[C I]</td></tr><tr><td>492.2795</td><td>2.0</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>492.7841</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>493.7000</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>493.7350</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>494.4820</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>494.7781</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>495.1741</td><td>1.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>496.9226</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>497.8296</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>501.5897</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>503.0142</td><td>0.1</td><td>H<sup>34</sup>S</td></tr><tr><td>504.2008</td><td>0.2</td><td>DCO<sup>+</sup></td></tr><tr><td>504.2948</td><td>1.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>504.6783</td><td>0.1</td><td>SO</td></tr><tr><td>505.5658</td><td>1.5</td><td>o-H<sub>2</sub>S</td></tr><tr><td>505.7633</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>505.8343</td><td>1.7</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>506.1548</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>506.7728</td><td>0.2</td><td>H<sub>2</sub>CS</td></tr><tr><td>506.8273</td><td>0.2</td><td>DCN</td></tr><tr><td>508.5369</td><td>0.1</td><td><sup>13</sup>CS</td></tr><tr><td>508.7069</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>509.0924</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>509.1469</td><td>0.8</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>509.2939</td><td>0.3</td><td>HDO</td></tr><tr><td>509.5654<sup>b</sup></td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>509.8314</td><td>0.3</td><td>+ o-H<sub>2</sub>CO</td></tr><tr><td>510.1559</td><td>0.9</td><td>p-H<sub>2</sub>CO</td></tr></tbody></table>

<footnote><sup>a</sup> JPL database used for these species. For all other species, the CDMS database is used.</footnote>
<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency (GHz)</th><th>T<sub>A</sub> (K)</th><th>Species</th></tr></thead><tbody><tr><td>510.2389</td><td>0.9</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>510.3459</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>510.9114</td><td>0.1</td><td>H<sup>18</sup>O<sup>+</sup></td></tr><tr><td>511.0904</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>511.5024</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>511.7166</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>511.9455</td><td>0.2</td><td>HCS<sup>+</sup></td></tr><tr><td>513.0775</td><td>0.7</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>513.3610</td><td>0.1</td><td>H<sub>2</sub>CS</td></tr><tr><td>513.3698</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>514.8535</td><td>0.7</td><td>SO</td></tr><tr><td>515.1700</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>515.3335</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>515.8230</td><td>0.1</td><td>Ghost</td></tr><tr><td>516.2616</td><td>0.2</td><td>H<sup>15</sup>N</td></tr><tr><td>516.3361<sup>b</sup></td><td>0.7</td><td>SO</td></tr><tr><td></td><td></td><td>+ H<sub>2</sub>CS</td></tr><tr><td>517.3551</td><td>0.9</td><td>SO</td></tr><tr><td>517.9706</td><td>0.4</td><td>H<sup>13</sup>CN</td></tr><tr><td>520.1801</td><td>1.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>520.4612</td><td>1.1</td><td>H<sup>13</sup>CO<sup>+</sup></td></tr><tr><td>520.7297</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>520.8817</td><td>0.1</td><td>SiO</td></tr><tr><td>522.4057</td><td>0.1</td><td>H<sub>2</sub>CS</td></tr><tr><td>523.1002</td><td>0.0</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>523.2752</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>523.4827</td><td>0.1</td><td><sup>13</sup>C<sup>18</sup>O</td></tr><tr><td>523.9727</td><td>2.2</td><td>CCH</td></tr><tr><td>524.0352</td><td>1.8</td><td>CCH</td></tr><tr><td>524.2682</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.5847</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.6673</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.7418</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.8053</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.8628</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.9098</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>524.9483</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>525.0548</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>525.6663</td><td>2.5</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>526.0363</td><td>0.1</td><td>SH<sup>+</sup></td></tr><tr><td>526.0453</td><td>0.1</td><td>SH<sup>+</sup></td></tr><tr><td>526.5233</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>526.5483</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>526.7878</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>527.0548</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>527.1738</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>527.6608</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>528.1813</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>528.6833</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>529.1419</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>529.2904</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>529.5409</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>529.8679</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>529.9739</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>530.0699</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>530.1234</td><td>0.3</td><td>C<sup>34</sup>S</td></tr><tr><td>530.1849</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>530.0244</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>530.3174</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>530.4559</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>530.5499</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>530.6124</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>530.6484</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr></tbody></table>

<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency (GHz)</th><th>T<sub>A</sub> (K)</th><th>Species</th></tr></thead><tbody><tr><td>530.8244</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>531.0804</td><td>1.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>531.3199</td><td>1.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>531.6384</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>531.7159</td><td>7.5</td><td>HCN</td></tr><tr><td>531.8709</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>531.8924</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>532.0334</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>532.0709</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>532.1349</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>532.3239</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>532.4669</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>532.5684</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>532.7214</td><td>2.4</td><td>CH</td></tr><tr><td>532.7909</td><td>1.0</td><td>CH</td></tr><tr><td>533.3810</td><td>0.1</td><td>Ghost</td></tr><tr><td>535.0610</td><td>14.6</td><td>HCO<sup>+</sup></td></tr><tr><td>536.1925</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>536.7585</td><td>2.1</td><td>CH</td></tr><tr><td>536.7805</td><td>0.5</td><td>CH</td></tr><tr><td>536.7925</td><td>0.9</td><td>CH</td></tr><tr><td>538.5716</td><td>2.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>538.6891</td><td>3.4</td><td>CS</td></tr><tr><td>539.2806</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>540.4656</td><td>0.2</td><td>H<sub>2</sub>CS</td></tr><tr><td>540.9236</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>541.7536</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>541.8162</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>542.0022</td><td>1.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>542.0832</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>543.0777</td><td>1.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>543.8987</td><td>0.1</td><td>HNC</td></tr><tr><td>545.0437<sup>b</sup></td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td></td><td></td><td>+ A-CH<sub>3</sub>OH</td></tr><tr><td>545.1032</td><td>0.2</td><td>Ghost</td></tr><tr><td>545.8872</td><td>0.2</td><td>Ghost</td></tr><tr><td>546.2488</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>547.3003</td><td>0.2</td><td>Ghost</td></tr><tr><td>547.6768</td><td>0.3</td><td>H<sub>2</sub><sup>18</sup>O</td></tr><tr><td>548.8313</td><td>8.1</td><td>C<sup>18</sup>O</td></tr><tr><td>549.2998</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>549.5506</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>549.5533</td><td>0.1</td><td>NO</td></tr><tr><td>550.6564</td><td>0.0</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>550.9254</td><td>29.4</td><td><sup>13</sup>CO</td></tr><tr><td>551.1874</td><td>0.3</td><td>NO</td></tr><tr><td>551.5159</td><td>0.1</td><td>Ghost</td></tr><tr><td>551.5344</td><td>0.3</td><td>NO</td></tr><tr><td>553.1474</td><td>1.0</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>554.0569</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>554.5784</td><td>0.1</td><td>HCS<sup>+</sup></td></tr><tr><td>555.6670</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>556.9370</td><td>7.2</td><td>o-H<sub>2</sub>O</td></tr><tr><td>557.1260</td><td>0.1</td><td>H<sub>2</sub>CS</td></tr><tr><td>558.0870</td><td>0.3</td><td>SO</td></tr><tr><td>558.3465</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>558.9681</td><td>2.5</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>559.3216</td><td>0.4</td><td>SO</td></tr><tr><td>560.1781</td><td>0.5</td><td>SO</td></tr><tr><td>560.2496</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>560.2716</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>560.3001</td><td>0.2</td><td>Ghost</td></tr></tbody></table>
<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency (GHz)</th><th>T<sub>A</sub> (K)</th><th>Species</th></tr></thead><tbody><tr><td>Band 1b</td><td></td><td></td></tr><tr><td>556.9370</td><td>8.4</td><td>o-H<sub>2</sub>O</td></tr><tr><td>558.0875</td><td>0.5</td><td>SO</td></tr><tr><td>558.3460</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>558.9681</td><td>3.4</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>559.3206</td><td>0.5</td><td>SO</td></tr><tr><td>560.1781</td><td>0.6</td><td>SO</td></tr><tr><td>561.7136</td><td>3.0</td><td>C<sup>17</sup>O</td></tr><tr><td>561.9001</td><td>2.7</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>564.2522</td><td>0.1</td><td>SiO</td></tr><tr><td>566.7312</td><td>1.3</td><td>CN</td></tr><tr><td>566.9477</td><td>1.6</td><td>CN</td></tr><tr><td>567.2612</td><td>0.2</td><td>Ghost</td></tr><tr><td>567.5953</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>568.2358</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>568.4353</td><td>0.2</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>568.5673</td><td>1.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>568.7853</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>570.2434</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>572.4974</td><td>3.3</td><td>o-NH<sub>3</sub></td></tr><tr><td>572.8984</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>574.1399</td><td>0.1</td><td>H<sub>2</sub>CS</td></tr><tr><td>574.8084</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>574.8694</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>576.2050<sup>b</sup></td><td>0.4</td><td>DCO<sup>+</sup></td></tr><tr><td>576.2660</td><td>62.0</td><td>CO</td></tr><tr><td>576.3835</td><td>0.2</td><td>Ghost</td></tr><tr><td>576.7095</td><td>1.1</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>578.0080</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>578.2165</td><td>0.2</td><td>C<sup>34</sup>S</td></tr><tr><td>579.0860</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>579.1520</td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>579.1995</td><td>0.1</td><td>DCN</td></tr><tr><td>579.4605</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>579.8590</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>579.9225</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>580.0600</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>580.1760</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>580.2135</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>580.3696</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>580.4446</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>580.5026</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>580.9036</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>581.0916</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>581.6131</td><td>0.5</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>582.3841</td><td>0.2</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>582.7246</td><td>0.2</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>583.1456</td><td>0.6</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>583.3096</td><td>0.5</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>584.4511</td><td>1.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>584.8227</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>587.4537</td><td>0.4</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>587.5702</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>587.6167</td><td>2.3</td><td>CS</td></tr><tr><td>589.1653</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>589.8703</td><td>0.1</td><td>CO<sup>+</sup></td></tr><tr><td>590.2793</td><td>1.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>590.4418</td><td>1.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>590.7522</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>590.7923</td><td>0.9</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>591.8218</td><td>0.1</td><td>H<sub>2</sub>CS</td></tr><tr><td>593.9424</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>593.9624</td><td>0.1</td><td>SO<sub>2</sub></td></tr></tbody></table>

<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency (GHz)</th><th>T<sub>A</sub> (K)</th><th>Species</th></tr></thead><tbody><tr><td>597.2084</td><td>0.1</td><td>HCS<sup>+</sup></td></tr><tr><td>598.5485</td><td>-0.1</td><td>Ghost</td></tr><tr><td>599.9280</td><td>0.3</td><td>HDO</td></tr><tr><td>600.3320</td><td>1.7</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>600.9065</td><td>0.1</td><td><sup>13</sup>CS</td></tr><tr><td>601.2570</td><td>0.4</td><td>SO</td></tr><tr><td>601.8521</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>602.2346</td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>602.2750</td><td></td><td>HC<sup>15</sup>N</td></tr><tr><td>602.2916</td><td>0.4</td><td>SO</td></tr><tr><td>603.0236</td><td>0.5</td><td>SO</td></tr><tr><td>604.2641</td><td>0.2</td><td>H<sup>13</sup>CN</td></tr><tr><td>604.3696</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>605.8801</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>607.1762</td><td>0.8</td><td>H<sup>13</sup>CO<sup>+</sup></td></tr><tr><td>607.2167</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>607.6112</td><td>0.1</td><td>SiO</td></tr><tr><td>607.7982</td><td>0.2</td><td>H<sub>2</sub>CS</td></tr><tr><td>608.0984</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>609.7087</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>611.2688</td><td>1.2</td><td>CCH</td></tr><tr><td>611.3308</td><td>1.0</td><td>CCH</td></tr><tr><td>611.5518</td><td>0.1</td><td>SO</td></tr><tr><td>613.0798</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>616.9814</td><td>1.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>620.3035</td><td>5.6</td><td>HCN</td></tr><tr><td>620.7045</td><td>0.6</td><td>o-H<sub>2</sub>O</td></tr><tr><td>622.5705</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>622.6605</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>622.7755</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>624.1801</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>624.2081</td><td>13.3</td><td>HCO<sup>+</sup></td></tr><tr><td>624.9616</td><td>1.0</td><td>H<sup>37</sup>Cl</td></tr><tr><td>624.9751</td><td>1.4</td><td>H<sup>37</sup>Cl</td></tr><tr><td>624.9856</td><td>0.6</td><td>H<sup>37</sup>Cl</td></tr><tr><td>625.7521</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>625.7601</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>625.8996</td><td>2.1</td><td>HCl</td></tr><tr><td>625.9166</td><td>2.8</td><td>HCl</td></tr><tr><td>625.9296</td><td>1.5</td><td>HCl</td></tr><tr><td>626.0896</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>626.3521</td><td>0.1</td><td>C<sup>34</sup>S</td></tr><tr><td>626.4996</td><td>0.2</td><td>H<sub>2</sub>CS</td></tr><tr><td>626.5141</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>626.5566</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>626.6271</td><td>1.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>627.0203</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>627.1036</td><td>0.1</td><td>Ghost</td></tr><tr><td>627.1721</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>627.5602</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>628.0522</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>628.1422</td><td>0.2</td><td><sup>13</sup>C<sup>18</sup>O</td></tr><tr><td>628.3302</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>628.4482</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>628.4717</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>628.5142</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>628.5272</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>628.6627</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>628.6982</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>628.8182</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>628.8682</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>629.1417</td><td>1.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>629.3232</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr></tbody></table>
<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td>629.6517</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>629.9222</td><td>1.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>631.2847</td><td>0.2</td><td>Ghost</td></tr><tr><td>631.7038</td><td>1.7</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>632.1918</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>633.4248</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>634.5118</td><td>0.6</td><td>HNC</td></tr><tr><td>635.8673</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.3394</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.3979</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.4209</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td colspan="3">Band 2a</td></tr><tr><td>626.5191</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>626.6271</td><td>1.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>627.1711</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>627.5607</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>629.1417</td><td>1.0</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>629.3242</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>629.6482</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>629.9232</td><td>1.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>631.7038</td><td>1.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>633.4233</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>634.5113</td><td>0.5</td><td>HNC</td></tr><tr><td>636.2514</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.2749</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.3059</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.3349</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.3669</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.3949</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.4209</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.5199</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>636.5339</td><td>1.3</td><td>CS</td></tr><tr><td>638.2804</td><td>0.7</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>638.5259</td><td>1.0</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>638.8194</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>644.3252</td><td>0.2</td><td>NH<sub>2</sub></td></tr><tr><td>644.3790</td><td>0.4</td><td>SO</td></tr><tr><td>645.2576</td><td>0.4</td><td>SO</td></tr><tr><td>645.8756</td><td>0.4</td><td>SO</td></tr><tr><td>645.9282</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>647.0831</td><td>0.2</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>647.6130</td><td>0.2</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>648.1956</td><td>0.2</td><td>DCO<sup>+</sup></td></tr><tr><td>649.5402</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>651.2997</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>651.4352</td><td>0.3</td><td>NO</td></tr><tr><td>651.6177</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>651.7742</td><td>0.4</td><td>NO</td></tr><tr><td>652.0972</td><td>2.8</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>653.9703</td><td>0.4</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>655.2128</td><td>0.2</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>655.6353</td><td>0.2</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>656.1653</td><td>0.6</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>656.1723</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>656.4663</td><td>0.5</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>658.5544</td><td>7.7</td><td>C<sup>18</sup>O</td></tr><tr><td>661.0659</td><td>30.3</td><td><sup>13</sup>CO</td></tr><tr><td>662.2105</td><td>0.4</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>664.8193</td><td>0.1</td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td>665.2485</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>665.4440</td><td>1.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>670.3602</td><td>0.2</td><td>SO<sub>2</sub></td></tr></tbody></table>

<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td>670.4242</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>672.5657</td><td>0.2</td><td>SO<sub>2</sub></td></tr><tr><td>672.8362</td><td>0.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>672.9037</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>673.4172</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>673.7472</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>674.0107</td><td>2.4</td><td>C<sup>17</sup>O</td></tr><tr><td>674.8113</td><td>1.1</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>674.9913<sup>b</sup></td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>675.0558</td><td>0.2</td><td>+ E-CH<sub>3</sub>OH</td></tr><tr><td>675.1353</td><td>0.5</td><td>H<sub>2</sub>CS</td></tr><tr><td>675.6138</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>675.7748</td><td>0.8</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>676.2143</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>676.4618</td><td>0.1</td><td>SO<sub>2</sub></td></tr><tr><td>676.7523</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>676.8298</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>677.0138</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>677.7113</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>678.2528</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>678.7688</td><td>0.2</td><td>Ghost</td></tr><tr><td>678.7864</td><td>1.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>680.0429</td><td>0.6</td><td>CN</td></tr><tr><td>680.2599</td><td>0.8</td><td>CN</td></tr><tr><td>681.5310</td><td>-0.1</td><td>Ghost</td></tr><tr><td>681.9919</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>685.4375</td><td>1.0</td><td>CS</td></tr><tr><td>685.5050</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>686.7325</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>687.0220</td><td>0.1</td><td>H<sub>2</sub><sup>34</sup>S</td></tr><tr><td>687.1515</td><td>0.2</td><td>H<sub>2</sub><sup>33</sup>S</td></tr><tr><td>687.2270</td><td>0.8</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>687.3040</td><td>2.3</td><td>p-H<sub>2</sub>S</td></tr><tr><td>687.4571</td><td>0.4</td><td>SO</td></tr><tr><td>688.2021</td><td>0.3</td><td>SO</td></tr><tr><td>688.7286</td><td>0.3</td><td>SO</td></tr><tr><td>690.5551</td><td>0.2</td><td>H<sup>13</sup>CN</td></tr><tr><td>691.4706</td><td>64.4</td><td>CO</td></tr><tr><td>693.8787</td><td>0.4</td><td>H<sup>13</sup>CO<sup>+</sup></td></tr><tr><td>697.1083</td><td>0.1</td><td>Ghost</td></tr><tr><td>697.1448</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>698.5458</td><td>0.6</td><td>CCH</td></tr><tr><td>698.6083</td><td>0.6</td><td>CCH</td></tr><tr><td>701.3709<sup>b</sup></td><td>1.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td></td><td></td><td>+ E-CH<sub>3</sub>OH</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>CH<sub>3</sub>OCH<sub>3</sub></td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>E-CH<sub>3</sub>OH</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>E-CH<sub>3</sub>OH</td></tr><tr><td></td><td></td><td>o-H<sub>2</sub>S</td></tr><tr><td></td><td></td><td>+ H<sub>2</sub><sup>33</sup> S</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>HCN</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td></td><td></td><td>HCO<sup>+</sup></td></tr><tr><td></td><td></td><td>E-CH<sub>3</sub>OH</td></tr><tr><td></td><td></td><td>p-H<sub>2</sub>CO</td></tr></tbody></table>
<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td>718.1618</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>718.4378</td><td>0.9</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>719.6653</td><td>1.1</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>719.7293</td><td>1.0</td><td>Ghost</td></tr><tr><td>719.9548</td><td>1.5</td><td>Ghost</td></tr><tr><td>720.0118</td><td>0.9</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>720.4418</td><td>1.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>721.0118</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>723.0404</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>723.6219</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>724.1224</td><td>0.7</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>724.3489</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>725.0954</td><td>0.9</td><td>Ghost</td></tr><tr><td>716.9412</td><td>0.6</td><td>p-H<sub>2</sub>CO</td></tr><tr><td colspan="3"><strong>Band 2b</strong></td></tr><tr><td>718.1623</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>718.4378</td><td>1.0</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>719.6668</td><td>1.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>720.4433</td><td>1.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>721.0093</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>723.0429</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>723.2824</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>723.6199</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>724.1219</td><td>0.9</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>724.3409</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>725.1089</td><td>0.3</td><td>HNC</td></tr><tr><td>725.1279</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>725.3169</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>726.0540</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>726.2100</td><td>0.4</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>726.9025</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>728.0535</td><td>0.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>728.5860</td><td>0.3</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>728.5960</td><td>0.2</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>728.8650</td><td>1.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>729.2120</td><td>0.5</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>729.7260</td><td>0.4</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>730.5006</td><td>0.4</td><td>SO</td></tr><tr><td>730.5206</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>731.1416</td><td>0.3</td><td>SO</td></tr><tr><td>731.5981</td><td>0.3</td><td>SO</td></tr><tr><td>732.4336</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>732.7761</td><td>0.2</td><td><sup>13</sup>C<sup>18</sup>O</td></tr><tr><td>734.2706</td><td>0.4</td><td>H<sub>2</sub><sup>34</sup>S</td></tr><tr><td>734.3286</td><td>0.8</td><td>CS</td></tr><tr><td>734.8952</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>735.6762</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>736.0317</td><td>4.3</td><td>o-H<sub>2</sub>S</td></tr><tr><td>737.3407</td><td>0.4</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>737.6272</td><td>0.2</td><td>Ghost</td></tr><tr><td>741.2263</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>742.2408</td><td>0.2</td><td>H<sub>2</sub>CS</td></tr><tr><td>745.2119</td><td>1.8</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>747.3035</td><td>0.3</td><td>p-H<sub>2</sub>S</td></tr><tr><td>749.0735</td><td>0.8</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>751.5560</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>751.6766</td><td>0.3</td><td>NO</td></tr><tr><td>752.0321</td><td>7.9</td><td>p-H<sub>2</sub>O</td></tr><tr><td>752.1076</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>752.1366</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>752.1716</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>752.3111</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr></tbody></table>

<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td>753.4161</td><td>0.2</td><td>HDO</td></tr><tr><td>753.8671</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>754.2226</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>762.6378</td><td>0.9</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>763.8823</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>763.9533</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>764.5828</td><td>-0.5</td><td>Ghost</td></tr><tr><td>764.8119</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>765.5134</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>765.9404</td><td>0.2</td><td>o-H<sub>2</sub>S</td></tr><tr><td>766.0309</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.3974</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.6489</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.7124</td><td>1.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>766.7624</td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.8114</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.9094</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.9614</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>766.9844</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>768.2529</td><td>5.6</td><td>C<sup>18</sup>O</td></tr><tr><td>768.5404</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>770.8855</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>770.8980</td><td>0.9</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>771.1825</td><td>27.1</td><td><sup>13</sup>CO</td></tr><tr><td>771.5770</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>772.4425</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>772.4545</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>773.2611</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>773.4226</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>773.5136</td><td>0.3</td><td>SO</td></tr><tr><td>773.8896</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>773.9481</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>774.0666</td><td>0.2</td><td>SO</td></tr><tr><td>774.3331</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>774.4541</td><td>0.3</td><td>SO</td></tr><tr><td>775.5996</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>779.0072</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>779.0322</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>779.3822</td><td>1.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>780.5672</td><td>0.3</td><td>H<sup>13</sup>CO<sup>+</sup></td></tr><tr><td>783.0028</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>783.1993</td><td>0.6</td><td>CS</td></tr><tr><td>784.1793</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>785.8058</td><td>0.3</td><td>CCH</td></tr><tr><td>785.8679</td><td>0.2</td><td>CCH</td></tr><tr><td>786.2829<sup>b</sup></td><td>1.5</td><td>C<sup>17</sup>O</td></tr><tr><td></td><td></td><td>+ p-H<sub>2</sub>CO</td></tr><tr><td></td><td></td><td>Ghost</td></tr><tr><td>790.9360</td><td>0.7</td><td>CN</td></tr><tr><td>793.3410</td><td>0.4</td><td>CN</td></tr><tr><td>793.5480</td><td>0.3</td><td>CN</td></tr><tr><td>794.5211</td><td>0.2</td><td>Ghost</td></tr><tr><td>794.8206</td><td>0.2</td><td>Ghost</td></tr><tr><td>797.4306</td><td>1.7</td><td>HCN</td></tr><tr><td>798.3106</td><td>0.2</td><td>p-H<sub>2</sub>CO</td></tr><tr><td colspan="3"><strong>Band 3a</strong></td></tr><tr><td>802.2430</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>802.2810</td><td>0.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>802.4590</td><td>7.1</td><td>HCO<sup>+</sup></td></tr><tr><td>803.1130</td><td>0.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>806.6501</td><td>59.4</td><td>CO</td></tr><tr><td>807.8661</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>809.3431</td><td>6.8</td><td>[C I]</td></tr></tbody></table>
<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td>811.4452</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>812.5522</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>813.5442</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>815.0723</td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>815.6943</td><td>0.1</td><td>HNC</td></tr><tr><td>816.0153</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>816.4953</td><td>0.2</td><td>SO</td></tr><tr><td>816.9743</td><td>0.2</td><td>SO</td></tr><tr><td>817.3143</td><td>0.2</td><td>SO</td></tr><tr><td>818.6674</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>819.4844</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>820.5024</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>820.7644</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>821.4774</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>821.7014</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>821.8694</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>822.5475</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>823.0845</td><td>0.6</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>824.3525</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>824.7255</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>825.2795</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>827.4516</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>829.8906</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>830.3506</td><td>1.0</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>831.0487</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>832.0627</td><td>0.5</td><td>CS</td></tr><tr><td>832.7567</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>834.6517</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>834.7517</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>834.8397</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>834.9017</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>834.9577</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>835.0037</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>835.1358</td><td>3.0</td><td>CH<sup>+</sup></td></tr><tr><td>838.3088</td><td>0.8</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>840.2779</td><td>0.6</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>851.4161</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>851.9151</td><td>0.3</td><td>NO</td></tr><tr><td>853.5112</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>855.1542</td><td>0.3</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>857.9613</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td colspan="3"><strong>Band 3b</strong></td></tr><tr><td>860.4618</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>863.3639</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>863.4269</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>867.3250</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>869.0370</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>869.9821</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>870.1091</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>870.2811</td><td>0.2</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>873.0361</td><td>0.2</td><td>CCH</td></tr><tr><td>873.7811</td><td>0.1</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>875.3692</td><td>0.2</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>876.6462</td><td>0.1</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>877.9232</td><td>3.4</td><td>C<sup>18</sup>O</td></tr><tr><td>878.2273</td><td>0.7</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>879.0153</td><td>0.2</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>880.9043</td><td>0.3</td><td>CS</td></tr><tr><td>881.2703</td><td>21.6</td><td><sup>13</sup>CO</td></tr><tr><td>881.4223</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>881.7833</td><td>0.8</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>885.9664</td><td>1.2</td><td>HCN</td></tr></tbody></table>

<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency<br>(GHz)</th><th>T<sub>A</sub><br>(K)</th><th>Species</th></tr></thead><tbody><tr><td>890.1265</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>891.5586</td><td>5.5</td><td>HCO<sup>+</sup></td></tr><tr><td>893.6387</td><td>-0.7</td><td>HDO</td></tr><tr><td>894.6146</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>896.8077</td><td>0.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>898.5247</td><td>0.9</td><td>C<sup>17</sup>O</td></tr><tr><td>898.9777</td><td>0.2</td><td>Ghost</td></tr><tr><td>900.9658</td><td>0.1</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>902.9388</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>902.9838</td><td>0.2</td><td>SO</td></tr><tr><td>905.3959</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>905.3959</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>906.5939</td><td>0.2</td><td>CN</td></tr><tr><td>906.8029</td><td>0.2</td><td>CN</td></tr><tr><td>907.4303</td><td>0.2</td><td>NH<sub>2</sub></td></tr><tr><td>909.5120</td><td>0.3</td><td>o-H<sub>2</sub>CO</td></tr><tr><td>909.7400</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>910.8110</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>911.6440</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>912.1100</td><td>0.8</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>916.1771</td><td>0.5</td><td>p-H<sub>2</sub>O</td></tr><tr><td>916.6502</td><td>0.3</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>917.2702</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>917.4082</td><td>0.2</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>921.7973</td><td>59.5</td><td>CO</td></tr><tr><td>921.9873</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>923.5853</td><td>0.3</td><td>p-H<sub>2</sub>CO</td></tr><tr><td>926.5564</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>926.8944</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>929.7315</td><td>0.3</td><td>CS</td></tr><tr><td>930.2035</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>931.3885</td><td>0.4</td><td>N<sub>2</sub>H<sup>+</sup></td></tr><tr><td>933.6945</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>937.4826</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>947.4759</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>952.5422</td><td>-0.3</td><td>NH<sub>2</sub></td></tr><tr><td>952.5740</td><td>-0.8</td><td>NH<sub>2</sub></td></tr><tr><td>952.6268</td><td>-0.3</td><td>NH<sub>2</sub></td></tr><tr><td colspan="3"><strong>Band 4a</strong></td></tr><tr><td>960.4732</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>965.4513</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>974.4895</td><td>0.7</td><td>HCN</td></tr><tr><td>974.6895</td><td>0.3</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>974.8795</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>980.0316</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>980.6376</td><td>4.3</td><td>HCO<sup>+</sup></td></tr><tr><td>986.1018</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>987.5618</td><td>2.2</td><td>C<sup>18</sup>O</td></tr><tr><td>987.9298</td><td>8.5</td><td>p-H<sub>2</sub>O</td></tr><tr><td>991.3259</td><td>17.6</td><td><sup>13</sup>CO</td></tr><tr><td>991.5839</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>993.1019</td><td>1.7</td><td>o-H<sub>2</sub>S</td></tr><tr><td>1002.7782</td><td>0.8</td><td>p-H<sub>2</sub>S</td></tr><tr><td>1006.1242</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>1008.8183</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>1010.7323</td><td>0.6</td><td>C<sup>17</sup>O</td></tr><tr><td>1013.5664</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>1023.1986</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1036.6990</td><td>1.1</td><td>SO<sub>2</sub></td></tr><tr><td>1036.9070</td><td>66.9</td><td>CO</td></tr><tr><td>1039.0150</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1057.1194</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr></tbody></table>
<table><caption>**Table 3**
(Continued)</caption><thead><tr><th>Frequency (GHz)</th><th>T<sub>A</sub> (K)</th><th>Species</th></tr></thead><tbody><tr><td colspan="3"><strong>Band 4b</strong></td></tr><tr><td>1057.1239</td><td>0.5</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>1062.9821</td><td>1.0</td><td>HCN</td></tr><tr><td>1069.6982</td><td>2.8</td><td>HCO<sup>+</sup></td></tr><tr><td>1072.8303</td><td>1.0</td><td>o-H<sub>2</sub>S</td></tr><tr><td>1092.4668</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1097.1589</td><td>1.4</td><td>C<sup>18</sup>O</td></tr><tr><td>1097.3689</td><td>3.4</td><td>o-H<sub>2</sub>O</td></tr><tr><td>1101.3450</td><td>12.5</td><td><sup>13</sup>CO</td></tr><tr><td>1101.6990</td><td>-0.7</td><td>p-H<sub>2</sub><sup>18</sup>O</td></tr><tr><td>1105.3691</td><td>0.4</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>1113.3472</td><td>4.0</td><td>p-H<sub>2</sub>O</td></tr><tr><td colspan="3"><strong>Band 5a</strong></td></tr><tr><td>1113.3477</td><td>3.5</td><td>p-H<sub>2</sub>O</td></tr><tr><td>1119.8339</td><td>0.4</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1122.9060</td><td>0.3</td><td>C<sup>17</sup>O</td></tr><tr><td>1151.4506</td><td>0.6</td><td>HCN</td></tr><tr><td>1151.7555</td><td>0.9</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1151.9826</td><td>51.0</td><td>CO</td></tr><tr><td>1152.9207</td><td>0.6</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1153.1267</td><td>4.4</td><td>o-H<sub>2</sub>O</td></tr><tr><td>1153.5527</td><td>0.6</td><td>E-CH<sub>3</sub>OH</td></tr><tr><td>1158.7328</td><td>1.7</td><td>HCO<sup>+</sup></td></tr><tr><td>1162.7149<sup>b</sup></td><td>0.6</td><td>A-CH<sub>3</sub>OH + E-CH<sub>3</sub>OH</td></tr><tr><td>1162.9129</td><td>4.4</td><td>o-H<sub>2</sub>O</td></tr><tr><td>1168.1190</td><td>0.5</td><td>A-CH<sub>3</sub>OH</td></tr><tr><td>1168.4524</td><td>-1.1</td><td>p-NH<sub>3</sub></td></tr><tr><td>1196.0197</td><td>0.5</td><td>o-H<sub>2</sub>S</td></tr><tr><td>1206.7279</td><td>0.7</td><td>C<sup>18</sup>O</td></tr><tr><td>1207.6540</td><td>0.5</td><td>p-H<sub>2</sub>O</td></tr><tr><td>1211.3260</td><td>6.8</td><td><sup>13</sup>CO</td></tr><tr><td>1214.8529</td><td>-1.0</td><td>o-NH<sub>3</sub></td></tr><tr><td>1215.2457</td><td>-1.3</td><td>p-NH<sub>3</sub></td></tr><tr><td>1228.7924</td><td>1.3</td><td>p-H<sub>2</sub>O</td></tr><tr><td>1232.4685</td><td>-1.2</td><td>HF</td></tr><tr><td colspan="3"><strong>Band 5b</strong></td></tr><tr><td>1228.7922</td><td>1.7</td><td>p-H<sub>2</sub>O</td></tr><tr><td>1232.4692</td><td>-1.2</td><td>HF</td></tr><tr><td>1239.9125</td><td>0.4</td><td>HCN</td></tr><tr><td>1247.7406</td><td>0.8</td><td>HCO<sup>+</sup></td></tr><tr><td>1267.0091</td><td>44.6</td><td>CO</td></tr><tr><td colspan="3"><strong>Band 6a</strong></td></tr><tr><td>1496.9192</td><td>42.0</td><td>CO</td></tr><tr><td colspan="3"><strong>Band 6b</strong></td></tr><tr><td>1611.7859</td><td>37.3</td><td>CO</td></tr><tr><td>1669.9169</td><td>7.7</td><td>o-H<sub>2</sub>O</td></tr><tr><td colspan="3"><strong>Band 7a</strong></td></tr><tr><td>1726.5976</td><td>26.9</td><td>CO</td></tr><tr><td colspan="3"><strong>Band 7b</strong></td></tr><tr><td>1841.3367</td><td>20.1</td><td>CO</td></tr><tr><td>1900.5261</td><td>69.5</td><td>[C II]</td></tr></tbody></table>

<figure><img src="image_10.png" /><figcaption>**Figure 8.** Example of a blended line at 786.3 GHz, produced by C<sup>17</sup>O and H<sub>2</sub>CO. The red line shows the LTE modeled synthetic spectrum for C<sup>17</sup>O and the blue line shows that for H<sub>2</sub>CO (Tables 5 and 6). The green line is the superposition of these two components. Data are shown by the black histogram.</figcaption></figure>

lines were excluded from the modeling analysis presented in Section 3.

## 2.3. Line Profiles

Although all lines above the 3σ S/N level in intensity were identified, Gaussian fitting and subsequent modeling was only performed on lines that were above the 5σ noise level (where the noise is calculated from line-free regions of the spectrum immediately adjacent to the line). Gaussian fits were obtained using the Levenberg-Marquardt algorithm as implemented in the CASSIS software package and were done independently from LTE modeling, the latter of which will be described in Section 3.1. A linear or a second order baseline was fit to the data prior to Gaussian fitting, but was not removed so we could include the continuum in subsequent modeling (important for absorption lines).

In most cases, a single component Gaussian fit to a specific species could reasonably reproduce the observed lines. However, in some cases, a two component Gaussian fit was needed, one component being narrow (ΔV<sub>FWHM</sub> = 3–5 km s<sup>-1</sup>) and the other broad (ΔV<sub>FWHM</sub> = 7–14 km s<sup>-1</sup>); the latter could be the effect of a hot core, an outflow, or a shock. Figure 9 provides an example of a species that needed only a single component fit (<sup>13</sup>CO), whereas Figure 10 shows the spectra for HCN, a typical example of a species requiring a two component fit. In addition, <sup>12</sup>C<sup>16</sup>O line profiles are the only ones among 52 identified species, which clearly had a non-Gaussian shape, probably due to self-absorption. A few other transitions are seen in absorption rather than emission and are listed in Table 3 with negative intensities.

Table 4 shows the results of the Gaussian fitting for each species. The reported result for each individual line profile is the best Gaussian fit. We should note that, usually, the signal-to-noise ratio is lower, as we move to higher frequencies. In the case of a two component fit, the narrower component is referred to as “main” and the broad component is referred to as “wing.” The first column in Table 4 is the transition quantum number (an explanation of the quantum numbers is provided on
<table><caption>**Table 4**
Gaussian Fits to Lines above 5σ</caption><thead><tr><th colspan="8">[C I]</th></tr><tr><th>Transition<br>2s+1L<sub>|L+S|</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td><sup>3</sup>P<sub>1</sub> → <sup>3</sup>P<sub>0</sub></td><td>492161.28</td><td>5.2</td><td>7.6</td><td>4.7</td><td>26.1</td><td>23.62</td></tr><tr><td><sup>3</sup>P<sub>2</sub> → <sup>3</sup>P<sub>1</sub></td><td>809342.91</td><td>6.9</td><td>7.2</td><td>4.2</td><td>30.8</td><td>62.46</td></tr></tbody></table><table><thead><tr><th colspan="8">[C II]</th></tr><tr><th>Transition<br>2s+1L<sub>|L+S|</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td><sup>2</sup>P<sub>3/2</sub> → <sup>2</sup>P<sub>1/2</sub></td><td>1900527.55</td><td>69.1</td><td>8.6</td><td>3.8</td><td>279.8</td><td>91.21</td></tr></tbody></table><table><thead><tr><th colspan="8">CCH</th></tr><tr><th>Transition<br>N<sub>I,F<sub>1</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>6<sub>6.5,7</sub> → 5<sub>5.5,6</sub></td><td>523972.07</td><td>2.2</td><td>6.6</td><td>4.5</td><td>10.7</td><td>88.02</td></tr><tr><td>6<sub>5.5,6</sub> → 5<sub>4.5,5</sub></td><td>524034.40</td><td>1.9</td><td>6.7</td><td>4.0</td><td>8.1</td><td>88.04</td></tr><tr><td>7<sub>7.5,8</sub> → 6<sub>6.5,7</sub></td><td>611267.06</td><td>1.2</td><td>6.8</td><td>5.2</td><td>6.4</td><td>117.36</td></tr><tr><td>7<sub>6.5,6</sub> → 6<sub>5.5,5</sub></td><td>611329.64</td><td>1.0</td><td>7.0</td><td>4.9</td><td>5.0</td><td>117.38</td></tr><tr><td>8<sub>8.5,9</sub> → 7<sub>7.5,8</sub></td><td>698544.47</td><td>0.6</td><td>7.4</td><td>5.9</td><td>3.7</td><td>150.88</td></tr><tr><td>8<sub>7.5,7</sub> → 7<sub>6.5,6</sub></td><td>698607.43</td><td>0.5</td><td>7.0</td><td>5.2</td><td>2.8</td><td>150.91</td></tr><tr><td>9<sub>9.5,10</sub> → 8<sub>8.5,9</sub></td><td>785801.64</td><td>0.3</td><td>7.9</td><td>8.2</td><td>2.3</td><td>188.59</td></tr><tr><td>9<sub>8.5,8</sub> → 8<sub>7.5,7</sub></td><td>785864.19</td><td>0.2</td><td>7.0</td><td>5.8</td><td>1.3</td><td>188.62</td></tr></tbody></table><table><thead><tr><th colspan="8">CH</th></tr><tr><th>Transition<br>N<sub>K,J,F<sub>1</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>1<sub>1,1.5,1</sub> → 1<sub>-1,0.5,1</sub></td><td>532721.73</td><td>2.4</td><td>7.1</td><td>4.2</td><td>10.8</td><td>25.73</td></tr><tr><td>1<sub>1,1.5,1</sub> → 1<sub>-1,0.5,0</sub></td><td>532791.46</td><td>1.0</td><td>8.4</td><td>4.8</td><td>4.9</td><td>25.73</td></tr><tr><td>1<sub>-1,1.5,2</sub> → 1<sub>1,0.5,1</sub></td><td>536759.12</td><td>2.2</td><td>8.2</td><td>4.0</td><td>9.2</td><td>25.73</td></tr><tr><td>1<sub>-1,1.5,1</sub> → 1<sub>1,0.5,1</sub></td><td>536779.69</td><td>0.6</td><td>8.3</td><td>3.8</td><td>2.2</td><td>25.76</td></tr><tr><td>1<sub>-1,1.5,1</sub> → 1<sub>1,0.5,0</sub></td><td>536793.54</td><td>1.0</td><td>8.3</td><td>4.1</td><td>4.2</td><td>25.76</td></tr></tbody></table><table><thead><tr><th colspan="8">CH<sup>+</sup></th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>1 → 0</td><td>835135.84</td><td>4.0</td><td>8.3</td><td>4.8</td><td>20.4</td><td>40.08</td></tr></tbody></table><table><thead><tr><th colspan="8">A-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>+K,W<sup>π</sup></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>3<sub>2,0</sub><sup>+</sup> → 3<sub>1,0</sub><sup>-</sup></td><td>480269.83</td><td>0.7</td><td>6.7</td><td>3.7</td><td>2.7</td><td>51.64</td></tr><tr><td>2<sub>2,0</sub><sup>+</sup> → 2<sub>1,0</sub><sup>-</sup></td><td>481505.55</td><td>0.7</td><td>6.1</td><td>3.3</td><td>2.4</td><td>44.67</td></tr><tr><td>10<sub>0,0</sub><sup>+</sup> → 9<sub>0,0</sub><sup>+</sup></td><td>483141.47</td><td>1.5</td><td>6.6</td><td>4.3</td><td>6.9</td><td>127.6</td></tr><tr><td>10<sub>2,0</sub><sup>-</sup> → 9<sub>2,0</sub><sup>-</sup></td><td>483388.95</td><td>0.3</td><td>6.8</td><td>4.9</td><td>1.4</td><td>165.35</td></tr><tr><td>10<sub>3,0</sub><sup>+</sup> → 9<sub>3,0</sub><sup>+</sup></td><td>483553.40</td><td>0.2</td><td>5.5</td><td>6.4</td><td>1.7</td><td>177.46</td></tr><tr><td>10<sub>3,0</sub><sup>-</sup> → 9<sub>3,0</sub><sup>-</sup></td><td>483566.43</td><td>0.3</td><td>6.5</td><td>3.9</td><td>1.2</td><td>177.46</td></tr><tr><td>10<sub>2,0</sub><sup>+</sup> → 9<sub>2,0</sub><sup>+</sup></td><td>483762.05</td><td>0.2</td><td>6.6</td><td>5.7</td><td>1.4</td><td>165.4</td></tr><tr><td>2<sub>2,0</sub><sup>-</sup> → 2<sub>1,0</sub><sup>+</sup></td><td>484005.49</td><td>0.7</td><td>6.5</td><td>4.2</td><td>3.0</td><td>44.67</td></tr><tr><td>3<sub>2,0</sub><sup>-</sup> → 3<sub>1,0</sub><sup>+</sup></td><td>485263.94</td><td>0.8</td><td>6.6</td><td>4.0</td><td>3.5</td><td>51.64</td></tr><tr><td>4<sub>2,0</sub><sup>-</sup> → 4<sub>1,0</sub><sup>+</sup></td><td>486941.55</td><td>0.9</td><td>6.5</td><td>4.1</td><td>3.7</td><td>60.92</td></tr><tr><td>10<sub>1,0</sub><sup>-</sup> → 9<sub>1,0</sub><sup>-</sup></td><td>487532.70</td><td>0.6</td><td>6.5</td><td>4.4</td><td>2.9</td><td>143.28</td></tr><tr><td>5<sub>2,0</sub><sup>-</sup> → 5<sub>1,0</sub><sup>+</sup></td><td>489037.53</td><td>0.8</td><td>6.6</td><td>4.1</td><td>3.5</td><td>72.53</td></tr><tr><td>6<sub>2,0</sub><sup>-</sup> → 6<sub>1,0</sub><sup>+</sup></td><td>491551.87</td><td>0.7</td><td>6.3</td><td>4.1</td><td>2.9</td><td>86.46</td></tr><tr><td>4<sub>1,0</sub><sup>+</sup> → 3<sub>0,0</sub><sup>+</sup></td><td>492279.27</td><td>2.0</td><td>6.7</td><td>4.2</td><td>8.8</td><td>37.55</td></tr><tr><td>5<sub>3,0</sub><sup>+</sup> → 4<sub>2,0</sub><sup>+</sup></td><td>493699.96</td><td>1.3</td><td>6.5</td><td>3.7</td><td>5.1</td><td>84.62</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><caption>A-CH<sub>3</sub>OH</caption><thead><tr><th>Transition<br>J<sub>+K,Y</sub><sup>π</sup></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>5<sub>3,0</sub><sup>-</sup> → 4<sub>2,0</sub><sup>-</sup></td><td>493734.65</td><td>1.4</td><td>6.4</td><td>3.7</td><td>5.3</td><td>84.62</td></tr><tr><td>7<sub>2,0</sub><sup>-</sup> → 7<sub>1,0</sub><sup>+</sup></td><td>494482.35</td><td>0.6</td><td>6.5</td><td>4.3</td><td>2.6</td><td>102.7</td></tr><tr><td>8<sub>2,0</sub><sup>-</sup> → 8<sub>1,0</sub><sup>+</sup></td><td>497829.07</td><td>0.4</td><td>6.4</td><td>4.3</td><td>2.0</td><td>121.27</td></tr><tr><td>9<sub>2,0</sub><sup>-</sup> → 9<sub>1,0</sub><sup>+</sup></td><td>501589.39</td><td>0.4</td><td>6.7</td><td>4.0</td><td>1.5</td><td>142.15</td></tr><tr><td>10<sub>2,0</sub><sup>-</sup> → 10<sub>1,0</sub><sup>+</sup></td><td>505762.88</td><td>0.3</td><td>6.4</td><td>4.5</td><td>1.3</td><td>165.35</td></tr><tr><td>11<sub>2,0</sub><sup>-</sup> → 11<sub>1,0</sub><sup>+</sup></td><td>510345.79</td><td>0.2</td><td>6.4</td><td>4.7</td><td>1.0</td><td>190.86</td></tr><tr><td>16<sub>0,0</sub><sup>+</sup> → 15<sub>1,0</sub><sup>+</sup></td><td>515170.91</td><td>0.2</td><td>6.6</td><td>4.9</td><td>1.1</td><td>315.21</td></tr><tr><td>11<sub>1,0</sub><sup>+</sup> → 10<sub>1,0</sub><sup>+</sup></td><td>527054.34</td><td>0.4</td><td>6.5</td><td>3.9</td><td>1.6</td><td>166.37</td></tr><tr><td>11<sub>0,0</sub><sup>+</sup> → 10<sub>0,0</sub><sup>+</sup></td><td>531320.09</td><td>1.2</td><td>6.6</td><td>4.3</td><td>5.4</td><td>153.1</td></tr><tr><td>11<sub>2,0</sub><sup>-</sup> → 10<sub>2,0</sub><sup>-</sup></td><td>531636.16</td><td>0.2</td><td>7.1</td><td>6.9</td><td>1.7</td><td>190.87</td></tr><tr><td>11<sub>4,0</sub><sup>-</sup> → 10<sub>4,0</sub><sup>-</sup></td><td>531869.53</td><td>0.4</td><td>7.5</td><td>6.2</td><td>2.3</td><td>233.52</td></tr><tr><td>11<sub>3,0</sub><sup>-</sup> → 10<sub>3,0</sub><sup>-</sup></td><td>531893.14</td><td>0.3</td><td>6.9</td><td>4.8</td><td>1.4</td><td>202.98</td></tr><tr><td>11<sub>2,0</sub><sup>+</sup> → 10<sub>2,0</sub><sup>+</sup></td><td>532133.99</td><td>0.3</td><td>6.2</td><td>4.1</td><td>1.1</td><td>190.94</td></tr></tbody></table>

<table><caption>A-CH<sub>3</sub>OH</caption><thead><tr><th>Transition<br>J<sub>+K,Y</sub><sup>π</sup></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>11<sub>1,0</sub><sup>-</sup> → 10<sub>1,0</sub><sup>-</sup></td><td>536192.13</td><td>0.6</td><td>6.4</td><td>3.7</td><td>2.4</td><td>169.01</td></tr><tr><td>5<sub>1,0</sub><sup>+</sup> → 4<sub>0,0</sub><sup>+</sup></td><td>538571.19</td><td>2.1</td><td>6.7</td><td>4.4</td><td>9.7</td><td>49.06</td></tr><tr><td>6<sub>3,0</sub><sup>+</sup> → 5<sub>2,0</sub><sup>+</sup></td><td>542002.05</td><td>1.2</td><td>6.4</td><td>3.7</td><td>4.7</td><td>98.55</td></tr><tr><td>6<sub>3,0</sub><sup>-</sup> → 5<sub>2,0</sub><sup>-</sup></td><td>542082.94</td><td>1.2</td><td>6.5</td><td>3.7</td><td>4.7</td><td>98.55</td></tr><tr><td>12<sub>1,0</sub><sup>+</sup> → 11<sub>1,0</sub><sup>+</sup></td><td>574869.74</td><td>0.3</td><td>6.3</td><td>4.2</td><td>1.4</td><td>193.96</td></tr><tr><td>2<sub>2,0</sub><sup>-</sup> → 1<sub>1,0</sub><sup>-</sup></td><td>579085.75</td><td>1.3</td><td>6.5</td><td>3.7</td><td>5.2</td><td>44.67</td></tr><tr><td>12<sub>0,0</sub><sup>+</sup> → 11<sub>0,0</sub><sup>+</sup></td><td>579460.65</td><td>0.9</td><td>6.5</td><td>4.4</td><td>4.0</td><td>180.91</td></tr><tr><td>2<sub>2,0</sub><sup>+</sup> → 1<sub>1,0</sub><sup>+</sup></td><td>579922.27</td><td>1.3</td><td>6.5</td><td>4.1</td><td>5.7</td><td>44.67</td></tr><tr><td>12<sub>3,0</sub><sup>+</sup> → 11<sub>3,0</sub><sup>+</sup></td><td>580176.81</td><td>0.2</td><td>6.6</td><td>4.2</td><td>0.8</td><td>230.83</td></tr><tr><td>12<sub>3,0</sub><sup>-</sup> → 11<sub>3,0</sub><sup>-</sup></td><td>580212.19</td><td>0.2</td><td>7.3</td><td>5.3</td><td>1.1</td><td>230.83</td></tr><tr><td>12<sub>2,0</sub><sup>+</sup> → 11<sub>2,0</sub><sup>+</sup></td><td>580503.31</td><td>0.2</td><td>6.3</td><td>4.5</td><td>0.9</td><td>218.8</td></tr><tr><td>6<sub>1,0</sub><sup>+</sup> → 5<sub>0,0</sub><sup>+</sup></td><td>584450.72</td><td>2.5</td><td>6.6</td><td>4.3</td><td>11.3</td><td>62.87</td></tr><tr><td>12<sub>1,0</sub><sup>-</sup> → 11<sub>1,0</sub><sup>-</sup></td><td>584823.31</td><td>0.4</td><td>6.6</td><td>5.3</td><td>2.5</td><td>197.08</td></tr><tr><td>7<sub>3,0</sub><sup>+</sup> → 6<sub>2,0</sub><sup>+</sup></td><td>590278.73</td><td>1.0</td><td>6.5</td><td>3.9</td><td>4.3</td><td>114.79</td></tr><tr><td>7<sub>3,0</sub><sup>-</sup> → 6<sub>2,0</sub><sup>-</sup></td><td>590441.53</td><td>1.0</td><td>6.4</td><td>3.8</td><td>4.1</td><td>114.79</td></tr><tr><td>13<sub>1,0</sub><sup>+</sup> → 12<sub>1,0</sub><sup>+</sup></td><td>622660.02</td><td>0.3</td><td>6.4</td><td>4.3</td><td>1.4</td><td>223.85</td></tr><tr><td>3<sub>2,0</sub><sup>-</sup> → 2<sub>1,0</sub><sup>-</sup></td><td>626627.34</td><td>1.4</td><td>6.5</td><td>3.9</td><td>5.5</td><td>51.64</td></tr><tr><td>13<sub>0,0</sub><sup>+</sup> → 12<sub>0,0</sub><sup>+</sup></td><td>627559.43</td><td>0.6</td><td>6.5</td><td>5.4</td><td>3.4</td><td>211.03</td></tr><tr><td>13<sub>2,0</sub><sup>-</sup> → 12<sub>2,0</sub><sup>-</sup></td><td>628052.23</td><td>0.2</td><td>6.8</td><td>6.0</td><td>1.2</td><td>248.84</td></tr><tr><td>13<sub>3,0</sub><sup>+</sup> → 12<sub>3,0</sub><sup>+</sup></td><td>628471.51</td><td>0.2</td><td>6.2</td><td>6.3</td><td>1.3</td><td>260.99</td></tr><tr><td>13<sub>4,0</sub><sup>-</sup> → 12<sub>4,0</sub><sup>-</sup></td><td>628513.72</td><td>0.2</td><td>6.3</td><td>3.5</td><td>0.7</td><td>291.53</td></tr><tr><td>13<sub>3,0</sub><sup>-</sup> → 12<sub>3,0</sub><sup>-</sup></td><td>628524.83</td><td>0.2</td><td>7.1</td><td>5.3</td><td>1.1</td><td>261</td></tr><tr><td>13<sub>2,0</sub><sup>+</sup> → 12<sub>2,0</sub><sup>+</sup></td><td>628868.08</td><td>0.2</td><td>7.5</td><td>5.1</td><td>1.1</td><td>248.98</td></tr><tr><td>3<sub>2,0</sub><sup>+</sup> → 2<sub>1,0</sub><sup>+</sup></td><td>629141.49</td><td>1.4</td><td>6.5</td><td>4.1</td><td>6.2</td><td>51.64</td></tr><tr><td>7<sub>1,0</sub><sup>+</sup> → 6<sub>0,0</sub><sup>+</sup></td><td>629922.01</td><td>1.6</td><td>6.7</td><td>4.6</td><td>7.9</td><td>78.97</td></tr><tr><td>13<sub>1,0</sub><sup>-</sup> → 12<sub>1,0</sub><sup>-</sup></td><td>633424.48</td><td>0.4</td><td>6.3</td><td>4.9</td><td>2.1</td><td>227.48</td></tr><tr><td>7<sub>4,0</sub><sup>-</sup> → 7<sub>3,0</sub><sup>+</sup></td><td>636336.97</td><td>0.3</td><td>7.2</td><td>4.1</td><td>1.2</td><td>145.33</td></tr><tr><td>4<sub>4,0</sub><sup>-</sup> → 4<sub>3,0</sub><sup>+</sup></td><td>636422.01</td><td>0.5</td><td>6.0</td><td>2.8</td><td>1.5</td><td>103.56</td></tr><tr><td>3<sub>2,0</sub><sup>-</sup> → 2<sub>1,0</sub><sup>-</sup></td><td>626627.67</td><td>1.1</td><td>6.3</td><td>4.0</td><td>4.8</td><td>51.64</td></tr><tr><td>13<sub>0,0</sub><sup>+</sup> → 12<sub>0,0</sub><sup>+</sup></td><td>627560.25</td><td>0.5</td><td>6.1</td><td>3.9</td><td>2.0</td><td>211.03</td></tr><tr><td>3<sub>2,0</sub><sup>+</sup> → 2<sub>1,0</sub><sup>+</sup></td><td>629141.29</td><td>1.0</td><td>6.6</td><td>4.2</td><td>4.2</td><td>51.64</td></tr><tr><td>7<sub>1,0</sub><sup>+</sup> → 6<sub>0,0</sub><sup>+</sup></td><td>629921.68</td><td>1.1</td><td>6.8</td><td>5.0</td><td>5.9</td><td>78.97</td></tr><tr><td>13<sub>1,0</sub><sup>-</sup> → 12<sub>1,0</sub><sup>-</sup></td><td>633425.22</td><td>0.2</td><td>6.0</td><td>5.2</td><td>1.3</td><td>227.48</td></tr><tr><td>7<sub>4,0</sub><sup>-</sup> → 7<sub>3,0</sub><sup>+</sup></td><td>636335.86</td><td>0.3</td><td>7.7</td><td>4.4</td><td>1.4</td><td>145.33</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="7">A-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>+K,γπ</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>6<sub>4,0+</sub> → 6<sub>3,0-</sub></td><td>636365.90</td><td>0.3</td><td>6.1</td><td>4.4</td><td>1.6</td><td>129.09</td></tr><tr><td>5<sub>4,0-</sub> → 5<sub>3,0+</sub></td><td>636395.60</td><td>0.3</td><td>6.1</td><td>4.6</td><td>1.6</td><td>115.16</td></tr><tr><td>4<sub>4,0+</sub> → 4<sub>3,0-</sub></td><td>636420.70</td><td>0.3</td><td>6.6</td><td>3.5</td><td>1.0</td><td>103.56</td></tr></tbody><thead><tr><th colspan="7">A-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>+K,γπ</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>8<sub>3,0+</sub> → 7<sub>2,0+</sub></td><td>638524.78</td><td>0.9</td><td>6.4</td><td>4.4</td><td>4.3</td><td>133.36</td></tr><tr><td>8<sub>3,0-</sub> → 7<sub>2,0-</sub></td><td>638818.88</td><td>0.9</td><td>6.5</td><td>4.4</td><td>4.0</td><td>133.36</td></tr><tr><td>14<sub>1,0+</sub> → 13<sub>1,0+</sub></td><td>670424.18</td><td>0.2</td><td>6.3</td><td>6.8</td><td>1.6</td><td>256.02</td></tr><tr><td>4<sub>2,0-</sub> → 3<sub>1,0-</sub></td><td>673747.18</td><td>1.3</td><td>6.5</td><td>4.2</td><td>5.8</td><td>60.92</td></tr><tr><td>8<sub>1,0+</sub> → 7<sub>0,0+</sub></td><td>674991.12</td><td>1.3</td><td>6.8</td><td>4.5</td><td>6.2</td><td>97.38</td></tr><tr><td>14<sub>0,0+</sub> → 13<sub>0,0+</sub></td><td>675613.75</td><td>0.5</td><td>6.5</td><td>5.5</td><td>2.8</td><td>243.45</td></tr><tr><td>4<sub>2,0+</sub> → 3<sub>1,0+</sub></td><td>678786.36</td><td>1.4</td><td>6.5</td><td>3.9</td><td>5.9</td><td>60.93</td></tr><tr><td>14<sub>1,0-</sub> → 13<sub>1,0-</sub></td><td>681991.47</td><td>0.3</td><td>6.3</td><td>6.9</td><td>2.2</td><td>260.21</td></tr><tr><td>9<sub>3,0+</sub> → 8<sub>2,0+</sub></td><td>686733.14</td><td>0.7</td><td>6.3</td><td>4.0</td><td>2.8</td><td>154.25</td></tr><tr><td>9<sub>3,0-</sub> → 8<sub>2,0-</sub></td><td>687225.61</td><td>0.7</td><td>6.6</td><td>4.7</td><td>3.6</td><td>154.25</td></tr><tr><td>9<sub>1,0+</sub> → 8<sub>0,0+</sub></td><td>719665.76</td><td>1.0</td><td>6.6</td><td>5.2</td><td>5.7</td><td>118.08</td></tr><tr><td>5<sub>2,0-</sub> → 4<sub>1,0-</sub></td><td>720442.77</td><td>1.1</td><td>6.5</td><td>3.9</td><td>4.6</td><td>72.53</td></tr><tr><td>15<sub>0,0+</sub> → 14<sub>0,0+</sub></td><td>723621.75</td><td>0.4</td><td>6.0</td><td>4.8</td><td>1.8</td><td>278.18</td></tr><tr><td>9<sub>1,0+</sub> → 8<sub>0,0+</sub></td><td>719665.58</td><td>1.1</td><td>6.7</td><td>4.6</td><td>5.4</td><td>118.08</td></tr><tr><td>5<sub>2,0-</sub> → 4<sub>1,0-</sub></td><td>720442.56</td><td>1.3</td><td>6.5</td><td>4.1</td><td>5.7</td><td>72.53</td></tr><tr><td>15<sub>0,0+</sub> → 14<sub>0,0+</sub></td><td>723620.68</td><td>0.4</td><td>6.4</td><td>6.1</td><td>2.8</td><td>278.18</td></tr><tr><td>5<sub>2,0+</sub> → 4<sub>1,0+</sub></td><td>728863.72</td><td>1.4</td><td>6.5</td><td>4.3</td><td>6.3</td><td>72.53</td></tr><tr><td>15<sub>1,0-</sub> → 14<sub>1,0-</sub></td><td>730520.33</td><td>0.3</td><td>6.7</td><td>5.1</td><td>1.5</td><td>295.27</td></tr><tr><td>10<sub>3,0+</sub> → 9<sub>2,0+</sub></td><td>734895.06</td><td>0.5</td><td>6.5</td><td>5.1</td><td>2.8</td><td>177.46</td></tr><tr><td>10<sub>3,0-</sub> → 9<sub>2,0-</sub></td><td>735674.32</td><td>0.6</td><td>6.5</td><td>5.0</td><td>3.0</td><td>177.46</td></tr><tr><td>10<sub>1,0+</sub> → 9<sub>0,0+</sub></td><td>763953.80</td><td>0.8</td><td>6.8</td><td>5.5</td><td>4.5</td><td>141.08</td></tr><tr><td>6<sub>2,0-</sub> → 5<sub>1,0-</sub></td><td>766711.66</td><td>1.0</td><td>6.5</td><td>3.8</td><td>4.0</td><td>86.46</td></tr><tr><td>16<sub>1,0-</sub> → 15<sub>1,0-</sub></td><td>779006.31</td><td>0.4</td><td>7.9</td><td>4.2</td><td>1.9</td><td>332.65</td></tr><tr><td>6<sub>2,0+</sub> → 5<sub>1,0+</sub></td><td>779381.81</td><td>1.2</td><td>6.4</td><td>4.3</td><td>5.3</td><td>86.46</td></tr><tr><td>11<sub>3,0+</sub> → 10<sub>2,0+</sub></td><td>783002.74</td><td>0.4</td><td>6.6</td><td>4.1</td><td>1.9</td><td>202.98</td></tr><tr><td>11<sub>3,0-</sub> → 10<sub>2,0-</sub></td><td>784178.53</td><td>0.4</td><td>6.6</td><td>4.8</td><td>1.8</td><td>202.99</td></tr><tr><td>11<sub>1,0+</sub> → 10<sub>0,0+</sub></td><td>807866.57</td><td>0.6</td><td>6.8</td><td>5.2</td><td>3.1</td><td>166.37</td></tr><tr><td>7<sub>2,0-</sub> → 6<sub>1,0-</sub></td><td>812551.63</td><td>0.8</td><td>6.5</td><td>4.4</td><td>3.8</td><td>102.7</td></tr><tr><td>4<sub>4,0-</sub> → 3<sub>3,0-</sub></td><td>829891.72</td><td>0.7</td><td>6.9</td><td>4.6</td><td>3.1</td><td>103.56</td></tr><tr><td>7<sub>2,0+</sub> → 6<sub>1,0+</sub></td><td>830351.20</td><td>0.9</td><td>6.3</td><td>4.2</td><td>4.0</td><td>102.72</td></tr><tr><td>12<sub>3,0+</sub> → 11<sub>2,0+</sub></td><td>831048.06</td><td>0.3</td><td>5.9</td><td>4.4</td><td>1.4</td><td>230.83</td></tr><tr><td>12<sub>3,0-</sub> → 11<sub>2,0-</sub></td><td>832755.31</td><td>0.3</td><td>6.4</td><td>5.3</td><td>1.8</td><td>230.83</td></tr><tr><td>12<sub>1,0+</sub> → 11<sub>0,0+</sub></td><td>851415.12</td><td>0.6</td><td>7.0</td><td>4.7</td><td>3.0</td><td>193.96</td></tr><tr><td>8<sub>2,0-</sub> → 7<sub>1,0-</sub></td><td>857960.16</td><td>0.6</td><td>6.6</td><td>3.8</td><td>2.4</td><td>121.27</td></tr><tr><td>5<sub>4,0+</sub> → 4<sub>3,0+</sub></td><td>878227.11</td><td>0.6</td><td>6.8</td><td>4.5</td><td>2.7</td><td>115.16</td></tr><tr><td>13<sub>3,0+</sub> → 12<sub>2,0+</sub></td><td>879015.02</td><td>0.3</td><td>6.3</td><td>5.9</td><td>1.6</td><td>260.99</td></tr><tr><td>13<sub>3,0-</sub> → 12<sub>2,0-</sub></td><td>881420.97</td><td>0.3</td><td>6.9</td><td>6.6</td><td>1.8</td><td>261</td></tr></tbody></table>

<table><thead><tr><th colspan="7">A-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>+K,γπ</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>8<sub>2,0+</sub> → 7<sub>1,0+</sub></td><td>881783.47</td><td>0.7</td><td>6.5</td><td>4.5</td><td>3.6</td><td>121.29</td></tr><tr><td>13<sub>1,0+</sub> → 12<sub>0,0+</sub></td><td>894614.92</td><td>0.4</td><td>6.8</td><td>4.7</td><td>1.9</td><td>223.84</td></tr><tr><td>13<sub>1,0+</sub> → 12<sub>0,0+</sub></td><td>894614.92</td><td>0.4</td><td>6.8</td><td>4.7</td><td>1.9</td><td>223.84</td></tr><tr><td>9<sub>2,0-</sub> → 8<sub>1,0-</sub></td><td>902936.66</td><td>0.4</td><td>6.4</td><td>5.3</td><td>2.5</td><td>142.15</td></tr><tr><td>6<sub>4,0+</sub> → 5<sub>3,0+</sub></td><td>926555.20</td><td>0.4</td><td>7.0</td><td>5.3</td><td>2.5</td><td>129.09</td></tr><tr><td>9<sub>2,0+</sub> → 8<sub>1,0+</sub></td><td>933694.55</td><td>0.6</td><td>6.5</td><td>4.6</td><td>2.7</td><td>142.19</td></tr><tr><td>14<sub>1,0+</sub> → 13<sub>0,0+</sub></td><td>937479.55</td><td>0.3</td><td>6.6</td><td>5.8</td><td>2.0</td><td>256.02</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">A-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>±K,v<sub>π</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7<sub>4,0</sub><sup>-</sup> → 6<sub>3,0</sub><sup>-</sup></td><td>974878.74</td><td>0.4</td><td>6.4</td><td>6.4</td><td>2.9</td><td>145.33</td></tr><tr><td>10<sub>2,0</sub><sup>+</sup> → 9<sub>1,0</sub><sup>+</sup></td><td>986100.37</td><td>0.5</td><td>6.2</td><td>5.1</td><td>3.0</td><td>165.4</td></tr><tr><td>8<sub>4,0</sub><sup>+</sup> → 7<sub>3,0</sub><sup>+</sup></td><td>1023196.73</td><td>0.5</td><td>7.2</td><td>4.4</td><td>2.2</td><td>163.9</td></tr></tbody></table><table><thead><tr><th colspan="8">E-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>±K,v<sub>π</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>10<sub>0,0</sub> → 9<sub>0,0</sub></td><td>482283.13</td><td>0.7</td><td>6.4</td><td>3.8</td><td>2.8</td><td>132.71</td></tr><tr><td>10<sub>-1,0</sub> → 9<sub>-1,0</sub></td><td>482959.74</td><td>1.4</td><td>6.4</td><td>3.9</td><td>5.7</td><td>125.25</td></tr><tr><td>10<sub>1,0</sub> → 9<sub>1,0</sub></td><td>483687.10</td><td>0.5</td><td>6.5</td><td>3.9</td><td>2.2</td><td>140.83</td></tr><tr><td>10<sub>2,0</sub> → 9<sub>2,0</sub></td><td>484023.82</td><td>0.6</td><td>6.6</td><td>4.5</td><td>3.0</td><td>142.08</td></tr><tr><td>10<sub>-2,0</sub> → 9<sub>-2,0</sub></td><td>484072.13</td><td>0.3</td><td>6.8</td><td>5.0</td><td>1.6</td><td>145.73</td></tr><tr><td>7<sub>0,0</sub> → 6<sub>-1,0</sub></td><td>495173.84</td><td>1.2</td><td>6.6</td><td>3.9</td><td>4.8</td><td>70.18</td></tr><tr><td>7<sub>1,0</sub> → 6<sub>0,0</sub></td><td>504294.53</td><td>1.2</td><td>6.4</td><td>3.6</td><td>4.7</td><td>248.24</td></tr><tr><td>11<sub>1,0</sub> → 10<sub>2,0</sub></td><td>506153.78</td><td>0.2</td><td>6.6</td><td>5.1</td><td>1.0</td><td>166.37</td></tr><tr><td>10<sub>2,0</sub> → 9<sub>1,0</sub></td><td>509564.94</td><td>0.7</td><td>6.8</td><td>5.2</td><td>3.9</td><td>142.08</td></tr><tr><td>2<sub>-2,0</sub> → 1<sub>-1,0</sub></td><td>520179.58</td><td>1.1</td><td>6.7</td><td>4.1</td><td>5.0</td><td>24.96</td></tr><tr><td>14<sub>-1,0</sub> → 13<sub>0,0</sub></td><td>523275.25</td><td>0.3</td><td>6.5</td><td>4.9</td><td>1.4</td><td>241.04</td></tr></tbody></table><table><thead><tr><th colspan="8">E-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>±K,v<sub>π</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>8<sub>3,0</sub> → 8<sub>2,0</sub></td><td>530123.52</td><td>0.3</td><td>6.9</td><td>5.4</td><td>1.7</td><td>123.38</td></tr><tr><td>11<sub>0,0</sub> → 10<sub>0,0</sub></td><td>530184.87</td><td>0.5</td><td>6.6</td><td>4.6</td><td>2.5</td><td>158.15</td></tr><tr><td>7<sub>3,0</sub> → 7<sub>2,0</sub></td><td>530316.84</td><td>0.3</td><td>6.6</td><td>4.9</td><td>1.8</td><td>104.81</td></tr><tr><td>6<sub>3,0</sub> → 6<sub>2,0</sub></td><td>530455.52</td><td>0.4</td><td>6.5</td><td>4.1</td><td>1.9</td><td>88.56</td></tr><tr><td>5<sub>3,0</sub> → 5<sub>2,0</sub></td><td>530549.77</td><td>0.4</td><td>6.7</td><td>4.6</td><td>2.2</td><td>74.63</td></tr><tr><td>4<sub>3,0</sub> → 4<sub>2,0</sub></td><td>530611.06</td><td>0.4</td><td>6.6</td><td>4.3</td><td>2.0</td><td>63.03</td></tr><tr><td>3<sub>3,0</sub> → 3<sub>2,0</sub></td><td>530647.07</td><td>0.4</td><td>7.1</td><td>5.0</td><td>2.1</td><td>53.74</td></tr><tr><td>11<sub>-1,0</sub> → 10<sub>-1,0</sub></td><td>531080.10</td><td>1.1</td><td>6.5</td><td>4.3</td><td>4.9</td><td>150.74</td></tr><tr><td>11<sub>1,0</sub> → 10<sub>1,0</sub></td><td>532032.12</td><td>0.4</td><td>6.6</td><td>5.2</td><td>2.2</td><td>166.37</td></tr><tr><td>11<sub>2,0</sub> → 10<sub>2,0</sub></td><td>532467.35</td><td>0.5</td><td>6.4</td><td>4.6</td><td>2.7</td><td>167.63</td></tr><tr><td>11<sub>-2,0</sub> → 10<sub>-2,0</sub></td><td>532567.79</td><td>0.3</td><td>6.4</td><td>5.2</td><td>1.7</td><td>171.29</td></tr><tr><td>8<sub>0,0</sub> → 7<sub>-1,0</sub></td><td>543076.99</td><td>1.1</td><td>6.6</td><td>4.5</td><td>5.2</td><td>88.72</td></tr><tr><td>8<sub>1,0</sub> → 7<sub>0,0</sub></td><td>553147.29</td><td>0.9</td><td>6.4</td><td>3.6</td><td>3.6</td><td>96.73</td></tr><tr><td>11<sub>2,0</sub> → 10<sub>1,0</sub></td><td>558345.87</td><td>0.4</td><td>6.3</td><td>4.3</td><td>1.9</td><td>167.63</td></tr><tr><td>11<sub>2,0</sub> → 10<sub>1,0</sub></td><td>558345.39</td><td>0.5</td><td>6.6</td><td>4.5</td><td>2.3</td><td>167.63</td></tr><tr><td>3<sub>-2,0</sub> → 2<sub>-1,0</sub></td><td>568566.84</td><td>1.2</td><td>6.6</td><td>4.3</td><td>5.6</td><td>31.93</td></tr><tr><td>15<sub>-1,0</sub> → 14<sub>0,0</sub></td><td>572900.17</td><td>0.2</td><td>6.2</td><td>5.0</td><td>1.2</td><td>275.74</td></tr><tr><td>12<sub>0,0</sub> → 11<sub>0,0</sub></td><td>578007.58</td><td>0.4</td><td>6.4</td><td>4.6</td><td>1.9</td><td>185.89</td></tr><tr><td>12<sub>-1,0</sub> → 11<sub>-1,0</sub></td><td>579151.93</td><td>0.7</td><td>6.5</td><td>4.4</td><td>3.5</td><td>178.53</td></tr><tr><td>12<sub>1,0</sub> → 11<sub>1,0</sub></td><td>580369.39</td><td>0.3</td><td>6.6</td><td>4.5</td><td>1.5</td><td>194.22</td></tr><tr><td>12<sub>2,0</sub> → 11<sub>2,0</sub></td><td>580903.85</td><td>0.4</td><td>6.4</td><td>4.9</td><td>2.2</td><td>195.51</td></tr><tr><td>12<sub>-2,0</sub> → 11<sub>-2,0</sub></td><td>581092.64</td><td>0.3</td><td>6.5</td><td>4.8</td><td>1.3</td><td>199.18</td></tr><tr><td>9<sub>0,0</sub> → 8<sub>-1,0</sub></td><td>590791.90</td><td>0.8</td><td>6.5</td><td>4.1</td><td>3.7</td><td>109.56</td></tr><tr><td>9<sub>1,0</sub> → 8<sub>0,0</sub></td><td>602234.23</td><td>0.8</td><td>6.4</td><td>4.0</td><td>3.4</td><td>117.62</td></tr><tr><td>12<sub>2,0</sub> → 11<sub>1,0</sub></td><td>607217.09</td><td>0.3</td><td>6.4</td><td>5.2</td><td>1.7</td><td>195.51</td></tr><tr><td>4<sub>-2,0</sub> → 3<sub>-1,0</sub></td><td>616980.70</td><td>1.2</td><td>6.6</td><td>4.1</td><td>5.1</td><td>41.22</td></tr><tr><td>16<sub>-1,0</sub> → 15<sub>0,0</sub></td><td>622775.50</td><td>0.2</td><td>6.1</td><td>5.0</td><td>1.0</td><td>312.73</td></tr><tr><td>13<sub>0,0</sub> → 12<sub>0,0</sub></td><td>625750.66</td><td>0.3</td><td>6.4</td><td>5.4</td><td>1.7</td><td>215.92</td></tr><tr><td>13<sub>-1,0</sub> → 12<sub>-1,0</sub></td><td>627171.60</td><td>0.6</td><td>6.5</td><td>4.9</td><td>3.0</td><td>208.64</td></tr><tr><td>13<sub>1,0</sub> → 12<sub>1,0</sub></td><td>628698.28</td><td>0.2</td><td>6.1</td><td>5.0</td><td>1.1</td><td>224.39</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="7">E-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>&pm; K<sub>v<sub>t</sub></sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>13<sub>3,0</sub> &rarr; 12<sub>3,0</sub></td><td>628817.62</td><td>0.2</td><td>6.3</td><td>4.0</td><td>0.8</td><td>251.06</td></tr><tr><td>13<sub>2,0</sub> &rarr; 12<sub>2,0</sub></td><td>629322.36</td><td>0.4</td><td>6.7</td><td>5.0</td><td>2.0</td><td>225.71</td></tr><tr><td>13<sub>-2,0</sub> &rarr; 12<sub>-2,0</sub></td><td>629653.22</td><td>0.2</td><td>6.3</td><td>7.8</td><td>1.9</td><td>229.4</td></tr></tbody><thead><tr><th colspan="7">E-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>&pm; K<sub>v<sub>t</sub></sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>13<sub>-1,0</sub> &rarr; 12<sub>-1,0</sub></td><td>627171.35</td><td>0.5</td><td>6.6</td><td>4.4</td><td>2.3</td><td>208.64</td></tr><tr><td>13<sub>2,0</sub> &rarr; 12<sub>2,0</sub></td><td>629321.48</td><td>0.3</td><td>7.1</td><td>6.0</td><td>1.6</td><td>225.71</td></tr><tr><td>13<sub>-2,0</sub> &rarr; 12<sub>-2,0</sub></td><td>629651.72</td><td>0.2</td><td>7.0</td><td>5.2</td><td>1.1</td><td>229.4</td></tr><tr><td>10<sub>0,0</sub> &rarr; 9<sub>-1,0</sub></td><td>638280.27</td><td>0.7</td><td>6.7</td><td>4.4</td><td>3.1</td><td>132.71</td></tr><tr><td>10<sub>1,0</sub> &rarr; 9<sub>0,0</sub></td><td>651618.53</td><td>0.6</td><td>6.5</td><td>4.6</td><td>2.9</td><td>140.83</td></tr><tr><td>13<sub>2,0</sub> &rarr; 12<sub>1,0</sub></td><td>656166.61</td><td>0.6</td><td>8.1</td><td>6.4</td><td>3.8</td><td>225.71</td></tr><tr><td>5<sub>-2,0</sub> &rarr; 4<sub>-1,0</sub></td><td>665443.13</td><td>1.2</td><td>6.7</td><td>4.3</td><td>5.2</td><td>52.83</td></tr><tr><td>14<sub>0,0</sub> &rarr; 13<sub>0,0</sub></td><td>673416.97</td><td>0.3</td><td>6.6</td><td>4.9</td><td>1.4</td><td>248.24</td></tr><tr><td>14<sub>-1,0</sub> &rarr; 13<sub>-1,0</sub></td><td>675135.73</td><td>0.4</td><td>6.5</td><td>6.0</td><td>2.8</td><td>241.04</td></tr><tr><td>3<sub>3,0</sub> &rarr; 2<sub>2,0</sub></td><td>675773.95</td><td>0.7</td><td>6.8</td><td>4.9</td><td>3.6</td><td>53.74</td></tr><tr><td>14<sub>1,0</sub> &rarr; 13<sub>1,0</sub></td><td>677011.82</td><td>0.2</td><td>7.5</td><td>8.3</td><td>2.1</td><td>256.88</td></tr><tr><td>14<sub>2,0</sub> &rarr; 13<sub>2,0</sub></td><td>677711.91</td><td>0.3</td><td>6.1</td><td>4.9</td><td>1.7</td><td>258.24</td></tr><tr><td>11<sub>0,0</sub> &rarr; 10<sub>-1,0</sub></td><td>685505.14</td><td>0.5</td><td>7.0</td><td>5.9</td><td>3.2</td><td>158.15</td></tr><tr><td>6<sub>-2,0</sub> &rarr; 5<sub>-1,0</sub></td><td>713983.43</td><td>0.9</td><td>6.6</td><td>4.1</td><td>3.9</td><td>66.76</td></tr><tr><td>6<sub>-2,0</sub> &rarr; 5<sub>-1,0</sub></td><td>713983.43</td><td>0.9</td><td>6.6</td><td>4.1</td><td>3.9</td><td>66.76</td></tr><tr><td>4<sub>-4,0</sub> &rarr; 3<sub>-3,0</sub></td><td>718436.93</td><td>0.8</td><td>6.7</td><td>4.0</td><td>3.5</td><td>103.22</td></tr><tr><td>15<sub>-1,0</sub> &rarr; 14<sub>-1,0</sub></td><td>723040.58</td><td>0.4</td><td>6.9</td><td>5.4</td><td>2.0</td><td>275.74</td></tr><tr><td>4<sub>3,0</sub> &rarr; 3<sub>2,0</sub></td><td>724122.89</td><td>0.6</td><td>6.5</td><td>5.7</td><td>3.4</td><td>63.03</td></tr><tr><td>4<sub>3,0</sub> &rarr; 3<sub>2,0</sub></td><td>724122.10</td><td>0.8</td><td>6.8</td><td>5.3</td><td>4.2</td><td>63.03</td></tr><tr><td>12<sub>0,0</sub> &rarr; 11<sub>-1,0</sub></td><td>732433.68</td><td>0.4</td><td>6.4</td><td>5.1</td><td>2.2</td><td>185.89</td></tr><tr><td>12<sub>1,0</sub> &rarr; 11<sub>0,0</sub></td><td>751552.50</td><td>0.4</td><td>6.4</td><td>5.8</td><td>2.3</td><td>194.22</td></tr><tr><td>7<sub>-2,0</sub> &rarr; 6<sub>-1,0</sub></td><td>762636.47</td><td>0.7</td><td>6.7</td><td>4.4</td><td>3.4</td><td>83.02</td></tr><tr><td>9<sub>-3,0</sub> &rarr; 9<sub>-2,0</sub></td><td>766028.92</td><td>0.3</td><td>6.7</td><td>5.2</td><td>1.4</td><td>159.27</td></tr><tr><td>8<sub>-3,0</sub> &rarr; 8<sub>-2,0</sub></td><td>766396.97</td><td>0.4</td><td>6.6</td><td>5.9</td><td>2.3</td><td>138.38</td></tr><tr><td>7<sub>-3,0</sub> &rarr; 7<sub>-2,0</sub></td><td>766648.47</td><td>0.4</td><td>6.6</td><td>4.5</td><td>1.9</td><td>119.81</td></tr><tr><td>5<sub>-4,0</sub> &rarr; 4<sub>-3,0</sub></td><td>766761.68</td><td>0.8</td><td>6.6</td><td>3.3</td><td>2.9</td><td>114.82</td></tr><tr><td>6<sub>-3,0</sub> &rarr; 6<sub>-2,0</sub></td><td>766811.56</td><td>0.4</td><td>6.6</td><td>2.6</td><td>1.1</td><td>103.56</td></tr><tr><td>5<sub>-3,0</sub> &rarr; 5<sub>-2,0</sub></td><td>766908.51</td><td>0.4</td><td>6.8</td><td>4.2</td><td>1.9</td><td>89.63</td></tr><tr><td>4<sub>-3,0</sub> &rarr; 4<sub>-2,0</sub></td><td>766961.54</td><td>0.5</td><td>6.4</td><td>3.4</td><td>1.6</td><td>78.03</td></tr></tbody></table>

<table><thead><tr><th colspan="7">E-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>&pm; K<sub>v<sub>t</sub></sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>3<sub>-3,0</sub> &rarr; 3<sub>-2,0</sub></td><td>766983.75</td><td>0.4</td><td>6.4</td><td>3.1</td><td>1.2</td><td>68.74</td></tr><tr><td>5<sub>3,0</sub> &rarr; 4<sub>2,0</sub></td><td>772453.48</td><td>0.5</td><td>7.2</td><td>7.1</td><td>4.0</td><td>74.63</td></tr><tr><td>13<sub>0,0</sub> &rarr; 12<sub>-1,0</sub></td><td>779030.27</td><td>0.4</td><td>7.2</td><td>6.0</td><td>2.2</td><td>215.92</td></tr><tr><td>8<sub>-2,0</sub> &rarr; 7<sub>-1,0</sub></td><td>811444.68</td><td>0.5</td><td>7.0</td><td>6.0</td><td>3.4</td><td>101.6</td></tr><tr><td>6<sub>-4,0</sub> &rarr; 5<sub>-3,0</sub></td><td>815071.72</td><td>0.7</td><td>6.6</td><td>4.3</td><td>3.1</td><td>128.75</td></tr><tr><td>6<sub>3,0</sub> &rarr; 5<sub>2,0</sub></td><td>820764.66</td><td>0.4</td><td>6.2</td><td>4.4</td><td>1.8</td><td>88.56</td></tr><tr><td>9<sub>-2,0</sub> &rarr; 8<sub>-1,0</sub></td><td>860459.44</td><td>0.4</td><td>7.0</td><td>5.5</td><td>2.4</td><td>122.5</td></tr><tr><td>7<sub>-4,0</sub> &rarr; 6<sub>-3,0</sub></td><td>863365.78</td><td>0.5</td><td>6.7</td><td>5.2</td><td>2.9</td><td>145</td></tr><tr><td>7<sub>3,0</sub> &rarr; 6<sub>2,0</sub></td><td>869039.06</td><td>0.5</td><td>6.6</td><td>5.2</td><td>2.6</td><td>104.81</td></tr><tr><td>10<sub>-2,0</sub> &rarr; 9<sub>-1,0</sub></td><td>909738.07</td><td>0.3</td><td>6.9</td><td>4.7</td><td>1.6</td><td>145.73</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">E-CH<sub>3</sub>OH</th></tr><tr><th>Transition<br>J<sub>&pm; K<sub>v</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>8<sub>-4,0</sub> &rarr; 7<sub>-3,0</sub></td><td>911643.69</td><td>0.4</td><td>6.5</td><td>4.5</td><td>2.1</td><td>163.56</td></tr><tr><td>3<sub>-3,0</sub> &rarr; 2<sub>-2,0</sub></td><td>912109.65</td><td>0.7</td><td>6.6</td><td>5.1</td><td>3.5</td><td>68.74</td></tr><tr><td>8<sub>3,0</sub> &rarr; 7<sub>2,0</sub></td><td>917269.03</td><td>0.4</td><td>7.3</td><td>4.9</td><td>1.9</td><td>123.38</td></tr><tr><td>4<sub>-3,0</sub> &rarr; 3<sub>-2,0</sub></td><td>960473.04</td><td>0.6</td><td>6.4</td><td>5.3</td><td>3.1</td><td>78.03</td></tr></tbody><thead><tr><th colspan="8">CN, v = 0</th></tr><tr><th>Transition<br>N<sub>J,F<sub>i</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>5<sub>4,5,5,5</sub> &rarr; 4<sub>3,5,4,5</sub></td><td>566729.48</td><td>1.3</td><td>7.3</td><td>5.3</td><td>7.3</td><td>81.59</td></tr><tr><td>5<sub>5,5,5,5</sub> &rarr; 4<sub>4,5,4,5</sub></td><td>566946.10</td><td>1.6</td><td>7.6</td><td>5.6</td><td>9.8</td><td>81.64</td></tr><tr><td>6<sub>5,5,6,5</sub> &rarr; 5<sub>4,5,5,5</sub></td><td>680046.29</td><td>0.5</td><td>7.5</td><td>5.4</td><td>3.0</td><td>114.23</td></tr><tr><td>6<sub>6,5,6,5</sub> &rarr; 5<sub>5,5,5,5</sub></td><td>680263.15</td><td>0.7</td><td>7.5</td><td>5.4</td><td>4.1</td><td>114.29</td></tr><tr><td>7<sub>6,5,7,5</sub> &rarr; 6<sub>5,5,6,5</sub></td><td>793337.05</td><td>0.3</td><td>7.3</td><td>6.9</td><td>2.2</td><td>152.38</td></tr><tr><td>7<sub>7,5,7,5</sub> &rarr; 6<sub>6,5,6,5</sub></td><td>793552.12</td><td>0.3</td><td>7.6</td><td>6.4</td><td>1.8</td><td>152.38</td></tr></tbody><thead><tr><th colspan="8">CO</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>Main</td><td>5 &rarr; 4</td><td>576267.41</td><td>52.5</td><td>7.3</td><td>6.3</td><td>352.5</td><td>82.98</td></tr><tr><td>Wing</td><td>5 &rarr; 4</td><td>576267.63</td><td>7.7</td><td>7.2</td><td>19.1</td><td>156.7</td><td>82.98</td></tr><tr><td>Main</td><td>6 &rarr; 5</td><td>691472.71</td><td>48.2</td><td>7.2</td><td>5.8</td><td>299.0</td><td>116.16</td></tr><tr><td>Wing</td><td>6 &rarr; 5</td><td>691472.71</td><td>11.9</td><td>7.2</td><td>17.6</td><td>222.7</td><td>116.16</td></tr><tr><td>Main</td><td>7 &rarr; 6</td><td>806653.11</td><td>46.6</td><td>6.5</td><td>5.0</td><td>248.5</td><td>154.88</td></tr><tr><td>Wing</td><td>7 &rarr; 6</td><td>806651.38</td><td>7.8</td><td>7.2</td><td>22.4</td><td>185.5</td><td>154.88</td></tr><tr><td>Main</td><td>8 &rarr; 7</td><td>921801.29</td><td>45.2</td><td>6.5</td><td>5.1</td><td>244.5</td><td>199.11</td></tr><tr><td>Wing</td><td>8 &rarr; 7</td><td>921799.21</td><td>7.3</td><td>7.2</td><td>23.8</td><td>184.5</td><td>199.11</td></tr><tr><td>Main</td><td>9 &rarr; 8</td><td>1036911.45</td><td>45.8</td><td>7.3</td><td>6.0</td><td>292.2</td><td>248.88</td></tr><tr><td>Wing</td><td>9 &rarr; 8</td><td>1036911.85</td><td>11.7</td><td>7.2</td><td>18.0</td><td>223.7</td><td>248.88</td></tr><tr><td>Main</td><td>10 &rarr; 9</td><td>1151987.56</td><td>39.3</td><td>6.5</td><td>4.6</td><td>194.1</td><td>304.17</td></tr><tr><td>Wing</td><td>10 &rarr; 9</td><td>1151987.37</td><td>5.5</td><td>6.5</td><td>23.0</td><td>134.4</td><td>304.17</td></tr><tr><td>Main</td><td>11 &rarr; 10</td><td>1267014.10</td><td>31.2</td><td>7.1</td><td>5.0</td><td>166.0</td><td>364.97</td></tr><tr><td>Wing</td><td>11 &rarr; 10</td><td>1267016.60</td><td>10.8</td><td>6.5</td><td>15.0</td><td>173.1</td><td>367.97</td></tr><tr><td>Main</td><td>13 &rarr; 12</td><td>1496920.46</td><td>29.8</td><td>7.5</td><td>4.8</td><td>152.8</td><td>503.14</td></tr><tr><td>Wing</td><td>13 &rarr; 12</td><td>1496925.41</td><td>8.7</td><td>6.5</td><td>18.2</td><td>167.9</td><td>503.14</td></tr><tr><td>Main</td><td>14 &rarr; 13</td><td>1611790.99</td><td>28.5</td><td>7.5</td><td>4.9</td><td>148.6</td><td>580.5</td></tr><tr><td>Wing</td><td>14 &rarr; 13</td><td>1611792.67</td><td>4.9</td><td>7.2</td><td>21.9</td><td>114.6</td><td>580.5</td></tr><tr><td>Main</td><td>15 &rarr; 14</td><td>1726597.84</td><td>20.4</td><td>7.8</td><td>3.5</td><td>75.5</td><td>663.36</td></tr><tr><td>Wing</td><td>15 &rarr; 14</td><td>1726601.59</td><td>6.2</td><td>7.2</td><td>14.0</td><td>92.3</td><td>663.36</td></tr><tr><td>Main</td><td>16 &rarr; 15</td><td>1841340.61</td><td>14.0</td><td>7.8</td><td>4.0</td><td>59.4</td><td>751.73</td></tr><tr><td>Wing</td><td>16 &rarr; 15</td><td>1841344.53</td><td>4.0</td><td>7.2</td><td>15.0</td><td>63.2</td><td>751.73</td></tr></tbody><thead><tr><th colspan="8"><sup>13</sup>CO</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>5 &rarr; 4</td><td>550925.82</td><td>30.9</td><td>7.3</td><td>4.8</td><td>157.6</td><td>79.33</td></tr><tr><td>6 &rarr; 5</td><td>661066.67</td><td>30.8</td><td>7.3</td><td>4.7</td><td>155.2</td><td>111.05</td></tr><tr><td>7 &rarr; 6</td><td>771182.86</td><td>28.0</td><td>7.5</td><td>5.1</td><td>152.0</td><td>148.06</td></tr><tr><td>8 &rarr; 7</td><td>881271.54</td><td>22.6</td><td>7.4</td><td>4.7</td><td>112.0</td><td>190.36</td></tr><tr><td>9 &rarr; 8</td><td>991327.01</td><td>17.5</td><td>7.7</td><td>4.7</td><td>87.8</td><td>237.94</td></tr><tr><td>10 &rarr; 9</td><td>1101346.80</td><td>13.1</td><td>7.8</td><td>4.6</td><td>64.4</td><td>290.79</td></tr><tr><td>11 &rarr; 10</td><td>1211327.07</td><td>6.7</td><td>7.6</td><td>4.3</td><td>31.0</td><td>348.93</td></tr></tbody><thead><tr><th colspan="8">C<sup>18</sup>O</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>&Delta;V<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>&int;T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>5 &rarr; 4</td><td>548831.12</td><td>8.5</td><td>6.8</td><td>4.1</td><td>36.4</td><td>79.02</td></tr><tr><td>6 &rarr; 5</td><td>658553.65</td><td>8.0</td><td>6.9</td><td>3.7</td><td>31.5</td><td>110.63</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">C<sup>18</sup>O</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7 → 6</td><td>768252.15</td><td>5.8</td><td>7.0</td><td>4.1</td><td>25.4</td><td>147.5</td></tr><tr><td>8 → 7</td><td>877922.54</td><td>3.5</td><td>6.9</td><td>5.0</td><td>18.7</td><td>189.64</td></tr><tr><td>9 → 8</td><td>987559.09</td><td>2.2</td><td>7.6</td><td>5.9</td><td>13.8</td><td>237.03</td></tr><tr><td>10 → 9</td><td>1097163.80</td><td>1.5</td><td>6.8</td><td>3.2</td><td>5.1</td><td>289.69</td></tr></tbody><thead><tr><th colspan="8">C<sup>17</sup>O</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>5 → 4</td><td>561713.01</td><td>3.0</td><td>6.7</td><td>3.7</td><td>11.9</td><td>80.88</td></tr><tr><td>6 → 5</td><td>674009.48</td><td>2.4</td><td>6.6</td><td>3.7</td><td>9.3</td><td>113.23</td></tr><tr><td>7 → 6</td><td>786282.9<sup>b</sup></td><td>...</td><td>6.5</td><td>4.5</td><td>7.6</td><td>150.96</td></tr><tr><td>8 → 7</td><td>898523.38</td><td>0.9</td><td>7.0</td><td>4.1</td><td>4.0</td><td>194.09</td></tr><tr><td>9 → 8</td><td>1010731.41</td><td>0.4</td><td>7.2</td><td>3.5</td><td>1.5</td><td>242.59</td></tr><tr><td>10 → 9</td><td>1122902.89</td><td>0.2</td><td>7.4</td><td>4.2</td><td>1.1</td><td>296.49</td></tr></tbody><thead><tr><th colspan="8">C<sup>13</sup>C<sup>18</sup>O</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>5 → 4</td><td>523484.35</td><td>0.1</td><td>6.9</td><td>4.1</td><td>0.6</td><td>75.37</td></tr><tr><td>6 → 5</td><td>628141.57</td><td>0.1</td><td>6.6</td><td>2.6</td><td>0.3</td><td>105.52</td></tr></tbody><thead><tr><th colspan="8">CS, v = 0</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>Main</td><td>10 → 9</td><td>489750.85</td><td>4.1</td><td>7.3</td><td>4.3</td><td>18.8</td><td>129.29</td></tr><tr><td>Wing</td><td>10 → 9</td><td>489750.92</td><td>0.6</td><td>6.7</td><td>7.8</td><td>4.6</td><td>129.29</td></tr><tr><td>Main</td><td>11 → 10</td><td>538688.84</td><td>3.3</td><td>7.2</td><td>4.7</td><td>16.5</td><td>155.15</td></tr><tr><td>Wing</td><td>11 → 10</td><td>538688.92</td><td>0.3</td><td>7.0</td><td>16.9</td><td>4.5</td><td>155.15</td></tr><tr><td>Main</td><td>12 → 11</td><td>587616.41</td><td>2.2</td><td>7.1</td><td>4.9</td><td>11.2</td><td>183.35</td></tr><tr><td>Wing</td><td>12 → 11</td><td>587619.04</td><td>0.2</td><td>6.5</td><td>12.9</td><td>2.4</td><td>183.35</td></tr><tr><td>Main</td><td>13 → 12</td><td>636532.25</td><td>1.0</td><td>7.2</td><td>5.3</td><td>5.8</td><td>213.9</td></tr><tr><td>Wing</td><td>13 → 12</td><td>636531.41</td><td>0.2</td><td>8.0</td><td>15.0</td><td>3.9</td><td>213.9</td></tr><tr><td>Main</td><td>14 → 13</td><td>685435.93</td><td>1.0</td><td>7.0</td><td>6.0</td><td>6.6</td><td>246.79</td></tr><tr><td>Wing</td><td>14 → 13</td><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td><td>246.79</td></tr><tr><td>Main</td><td>15 → 14</td><td>734325.78</td><td>0.6</td><td>6.7</td><td>5.1</td><td>3.1</td><td>282.04</td></tr><tr><td>Wing</td><td>15 → 14</td><td>734327.70</td><td>0.2</td><td>6.5</td><td>20.4</td><td>4.8</td><td>282.04</td></tr><tr><td>Main</td><td>16 → 15</td><td>783201.36</td><td>0.3</td><td>7.2</td><td>5.0</td><td>1.4</td><td>319.62</td></tr><tr><td>Wing</td><td>16 → 15</td><td>783203.40</td><td>0.3</td><td>7.0</td><td>10.3</td><td>2.9</td><td>319.62</td></tr><tr><td>Main</td><td>17 → 16</td><td>832061.55</td><td>0.4</td><td>6.6</td><td>6.1</td><td>2.9</td><td>359.56</td></tr><tr><td>Wing</td><td>17 → 16</td><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td><td>359.56</td></tr><tr><td>Main</td><td>18 → 17</td><td>880903.85</td><td>0.3</td><td>7.2</td><td>9.0</td><td>2.9</td><td>401.83</td></tr><tr><td>Wing</td><td>18 → 17</td><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td><td>401.83</td></tr></tbody><thead><tr><th colspan="8">C<sup>13</sup>CS</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>11 → 10</td><td>508535.83</td><td>0.1</td><td>7.1</td><td>6.1</td><td>0.5</td><td>146.46</td></tr></tbody><thead><tr><th colspan="8">C<sup>34</sup>S</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr><tr><td>10 → 9</td><td>481916.67</td><td>0.3</td><td>6.8</td><td>4.6</td><td>1.4</td><td>127.23</td></tr><tr><td>11 → 10</td><td>530071.15</td><td>0.2</td><td>7.5</td><td>5.3</td><td>1.0</td><td>152.67</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">C<sup>34</sup>S</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>12 → 11</td><td>578215.88</td><td>0.2</td><td>7.6</td><td>7.3</td><td>1.3</td><td>180.42</td></tr></tbody></table><table><thead><tr><th colspan="8">DCN, v = 0</th></tr><tr><th>Transition<br>N<sub>k</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7<sub>0</sub> → 6<sub>0</sub></td><td>506825.63</td><td>0.2</td><td>6.9</td><td>5.2</td><td>1.0</td><td>97.3</td></tr></tbody></table><table><thead><tr><th colspan="8">DCO<sup>+</sup></th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7 → 6</td><td>504200.27</td><td>0.2</td><td>7.1</td><td>4.4</td><td>0.8</td><td>96.80</td></tr><tr><td>8 → 7</td><td>576205.0<sup>b</sup></td><td>...</td><td>...</td><td>...</td><td>...</td><td>124.45</td></tr><tr><td>9 → 8</td><td>648195.15</td><td>0.2</td><td>6.1</td><td>2.1</td><td>0.4</td><td>155.56</td></tr></tbody></table><table><thead><tr><th colspan="8">o-H<sub>2</sub>S</th></tr><tr><th>Transition<br>J<sub>Ω,Λ</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>2<sub>2,1</sub> → 2<sub>1,2</sub></td><td>505565.22</td><td>1.5</td><td>7.0</td><td>5.0</td><td>8.2</td><td>59.59</td></tr><tr><td>3<sub>1,2</sub> → 3<sub>0,3</sub></td><td>708470.60</td><td>0.4</td><td>6.9</td><td>7.5</td><td>3.5</td><td>116.99</td></tr><tr><td>2<sub>1,2</sub> → 1<sub>0,1</sub></td><td>736034.21</td><td>4.5</td><td>7.4</td><td>5.9</td><td>27.9</td><td>35.32</td></tr><tr><td>3<sub>0,3</sub> → 2<sub>1,2</sub></td><td>993107.06</td><td>1.7</td><td>5.8</td><td>6.3</td><td>11.4</td><td>82.99</td></tr><tr><td>2<sub>2,1</sub> → 1<sub>1,0</sub></td><td>1072837.04</td><td>0.9</td><td>7.7</td><td>6.0</td><td>5.7</td><td>59.59</td></tr></tbody></table><table><thead><tr><th colspan="8">p-H<sub>2</sub>S</th></tr><tr><th>Transition<br>J<sub>Ω,Λ</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>2<sub>0,2</sub> → 1<sub>1,1</sub></td><td>687303.34</td><td>2.4</td><td>7.1</td><td>5.1</td><td>12.7</td><td>54.7</td></tr><tr><td>3<sub>1,3</sub> → 2<sub>0,2</sub></td><td>1002777.30</td><td>0.6</td><td>7.4</td><td>5.6</td><td>3.8</td><td>102.82</td></tr></tbody></table><table><thead><tr><th colspan="8">H<sub>2</sub><sup>34</sup>S</th></tr><tr><th>Transition<br>N<sub>K<sub>α</sub>,K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>2<sub>1,2</sub> → 1<sub>0,1</sub></td><td>734269.67</td><td>0.3</td><td>6.9</td><td>4.1</td><td>1.3</td><td>55.01</td></tr></tbody></table><table><thead><tr><th colspan="8">H<sub>2</sub>CS</th></tr><tr><th>Transition<br>J<sub>K<sub>α</sub>,K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>14<sub>1,13</sub> → 13<sub>1,12</sub></td><td>487664.03</td><td>0.2</td><td>6.8</td><td>4.5</td><td>0.8</td><td>188.8</td></tr><tr><td>15<sub>1,15</sub> → 14<sub>1,14</sub></td><td>506771.50</td><td>0.2</td><td>6.6</td><td>5.2</td><td>1.1</td><td>207.86</td></tr><tr><td>15<sub>0,15</sub> → 14<sub>0,14</sub></td><td>513361.94</td><td>0.1</td><td>6.6</td><td>4.0</td><td>0.4</td><td>197.44</td></tr><tr><td>15<sub>2,13</sub> → 14<sub>2,12</sub></td><td>516336.1<sup>b</sup></td><td>...</td><td>...</td><td>...</td><td>...</td><td>250.71</td></tr><tr><td>15<sub>1,14</sub> → 14<sub>1,13</sub></td><td>522403.63</td><td>0.1</td><td>6.9</td><td>5.1</td><td>0.9</td><td>213.87</td></tr><tr><td>16<sub>1,16</sub> → 15<sub>1,15</sub></td><td>540465.31</td><td>0.1</td><td>6.5</td><td>3.5</td><td>0.5</td><td>233.79</td></tr><tr><td>17<sub>1,17</sub> → 16<sub>1,16</sub></td><td>574140.12</td><td>0.1</td><td>6.8</td><td>4.7</td><td>0.5</td><td>261.35</td></tr></tbody></table><table><thead><tr><th colspan="8">HF</th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>1 → 0</td><td>1232469.17</td><td>-1.1</td><td>8.7</td><td>3.2</td><td>-7.0</td><td>59.15</td></tr></tbody></table><table><thead><tr><th colspan="8">o-H<sub>2</sub>CO</th></tr><tr><th>Transition<br>J<sub>K<sub>α</sub>,K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7<sub>1,7</sub> → 6<sub>1,6</sub></td><td>491968.45</td><td>3.1</td><td>7.0</td><td>4.4</td><td>14.7</td><td>91.15</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">o-H<sub>2</sub>CO</th></tr><tr><th>Transition<br>J<sub>K<sub>u</sub>,K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7<sub>5,3</sub> → 6<sub>5,2</sub></td><td>509562.12<sup>b</sup></td><td>...</td><td>...</td><td>...</td><td>...</td><td>376.68</td></tr><tr><td>7<sub>3,5</sub> → 6<sub>3,4</sub></td><td>510155.94</td><td>0.9</td><td>6.9</td><td>4.8</td><td>4.4</td><td>188.73</td></tr><tr><td>7<sub>3,4</sub> → 6<sub>3,3</sub></td><td>510238.04</td><td>0.9</td><td>6.9</td><td>4.4</td><td>4.0</td><td>188.73</td></tr><tr><td>7<sub>1,6</sub> → 6<sub>1,5</sub></td><td>525666.11</td><td>2.5</td><td>6.8</td><td>4.6</td><td>12.2</td><td>97.63</td></tr><tr><td>8<sub>1,8</sub> → 7<sub>1,7</sub></td><td>561899.30</td><td>2.6</td><td>7.0</td><td>4.4</td><td>12.5</td><td>118.12</td></tr><tr><td>8<sub>5,3</sub> → 7<sub>5,2</sub></td><td>582382.77</td><td>0.2</td><td>6.6</td><td>6.3</td><td>1.3</td><td>404.63</td></tr><tr><td>8<sub>3,6</sub> → 7<sub>3,5</sub></td><td>583144.85</td><td>0.6</td><td>6.9</td><td>5.2</td><td>3.2</td><td>216.71</td></tr><tr><td>8<sub>3,5</sub> → 7<sub>3,4</sub></td><td>583308.64</td><td>0.6</td><td>7.0</td><td>4.6</td><td>2.8</td><td>216.73</td></tr><tr><td>8<sub>1,7</sub> → 7<sub>1,6</sub></td><td>600331.09</td><td>1.7</td><td>6.7</td><td>4.5</td><td>8.1</td><td>126.44</td></tr><tr><td>9<sub>1,9</sub> → 8<sub>1,8</sub></td><td>631703.48</td><td>1.5</td><td>6.7</td><td>4.6</td><td>7.3</td><td>148.43</td></tr><tr><td>9<sub>5,5</sub> → 8<sub>5,4</sub></td><td>655212.67</td><td>0.2</td><td>6.7</td><td>5.4</td><td>1.1</td><td>436.08</td></tr><tr><td>9<sub>3,7</sub> → 8<sub>3,6</sub></td><td>656166.83</td><td>0.6</td><td>6.0</td><td>6.2</td><td>3.9</td><td>248.2</td></tr><tr><td>9<sub>3,6</sub> → 8<sub>3,5</sub></td><td>656465.35</td><td>0.5</td><td>6.6</td><td>4.6</td><td>2.3</td><td>248.23</td></tr><tr><td>9<sub>1,8</sub> → 8<sub>1,7</sub></td><td>674810.63</td><td>1.1</td><td>6.6</td><td>4.8</td><td>5.4</td><td>158.83</td></tr><tr><td>10<sub>1,10</sub> → 9<sub>1,9</sub></td><td>701370.13</td><td>1.3</td><td>7.1</td><td>5.1</td><td>7.1</td><td>182.1</td></tr><tr><td>10<sub>5,6</sub> → 9<sub>5,5</sub></td><td>728052.29</td><td>0.2</td><td>7.5</td><td>5.1</td><td>1.0</td><td>471.02</td></tr><tr><td>10<sub>3,8</sub> → 9<sub>3,7</sub></td><td>729213.26</td><td>0.4</td><td>6.7</td><td>4.5</td><td>2.0</td><td>283.2</td></tr><tr><td>10<sub>3,7</sub> → 9<sub>3,6</sub></td><td>729725.77</td><td>0.3</td><td>6.7</td><td>5.9</td><td>2.1</td><td>283.25</td></tr><tr><td>10<sub>1,9</sub> → 9<sub>1,8</sub></td><td>749072.76</td><td>0.8</td><td>6.7</td><td>4.5</td><td>3.8</td><td>194.78</td></tr><tr><td>11<sub>1,11</sub> → 10<sub>1,10</sub></td><td>770895.15</td><td>0.7</td><td>7.4</td><td>7.7</td><td>5.7</td><td>219.09</td></tr><tr><td>11<sub>1,10</sub> → 10<sub>1,9</sub></td><td>823084.31</td><td>0.5</td><td>6.4</td><td>5.1</td><td>2.8</td><td>234.28</td></tr><tr><td>12<sub>1,12</sub> → 11<sub>1,11</sub></td><td>840277.03</td><td>0.5</td><td>6.5</td><td>4.8</td><td>2.5</td><td>259.42</td></tr><tr><td>12<sub>1,11</sub> → 11<sub>1,10</sub></td><td>896807.59</td><td>0.3</td><td>6.2</td><td>4.9</td><td>1.7</td><td>277.32</td></tr><tr><td>13<sub>1,13</sub> → 12<sub>1,12</sub></td><td>909511.04</td><td>0.3</td><td>5.9</td><td>6.0</td><td>2.0</td><td>303.07</td></tr></tbody></table><table><thead><tr><th colspan="8">p-H<sub>2</sub>CO</th></tr><tr><th>Transition<br>J<sub>K<sub>u</sub>,K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>7<sub>0,7</sub> → 6<sub>0,6</sub></td><td>505834.17</td><td>1.7</td><td>6.7</td><td>4.0</td><td>7.2</td><td>97.44</td></tr><tr><td>7<sub>2,6</sub> → 6<sub>2,5</sub></td><td>509146.74</td><td>0.8</td><td>6.7</td><td>4.2</td><td>3.4</td><td>144.93</td></tr><tr><td>7<sub>4,4</sub> → 6<sub>4,3</sub></td><td>509830.59</td><td>0.2</td><td>6.4</td><td>4.2</td><td>1.0</td><td>286.17</td></tr><tr><td>7<sub>2,5</sub> → 6<sub>2,4</sub></td><td>513076.79</td><td>0.7</td><td>6.7</td><td>4.5</td><td>3.2</td><td>145.35</td></tr><tr><td>8<sub>0,8</sub> → 7<sub>0,7</sub></td><td>576709.19</td><td>1.1</td><td>6.6</td><td>4.2</td><td>4.9</td><td>125.12</td></tr><tr><td>8<sub>2,7</sub> → 7<sub>2,6</sub></td><td>581612.27</td><td>0.5</td><td>6.8</td><td>4.3</td><td>2.3</td><td>172.84</td></tr><tr><td>8<sub>4,5</sub> → 7<sub>4,4</sub></td><td>582723.54</td><td>0.2</td><td>6.7</td><td>5.7</td><td>1.2</td><td>314.14</td></tr><tr><td>8<sub>2,6</sub> → 7<sub>2,5</sub></td><td>587454.12</td><td>0.5</td><td>6.8</td><td>4.8</td><td>2.4</td><td>173.55</td></tr><tr><td>9<sub>0,9</sub> → 8<sub>0,8</sub></td><td>647082.69</td><td>0.9</td><td>6.6</td><td>4.1</td><td>3.7</td><td>156.18</td></tr><tr><td>9<sub>2,8</sub> → 8<sub>2,7</sub></td><td>653971.43</td><td>0.4</td><td>6.4</td><td>4.6</td><td>1.9</td><td>204.23</td></tr><tr><td>9<sub>4,6</sub> → 8<sub>4,5</sub></td><td>655640.45</td><td>0.2</td><td>6.8</td><td>6.0</td><td>1.2</td><td>345.6</td></tr><tr><td>9<sub>2,7</sub> → 8<sub>2,6</sub></td><td>662209.75</td><td>0.4</td><td>6.7</td><td>4.5</td><td>1.9</td><td>205.33</td></tr><tr><td>10<sub>0,10</sub> → 9<sub>0,9</sub></td><td>716939.12</td><td>0.4</td><td>6.7</td><td>5.6</td><td>2.4</td><td>190.58</td></tr><tr><td>10<sub>2,9</sub> → 9<sub>2,8</sub></td><td>726209.22</td><td>0.3</td><td>6.6</td><td>6.5</td><td>2.0</td><td>239.08</td></tr><tr><td>10<sub>2,8</sub> → 9<sub>2,7</sub></td><td>737342.68</td><td>0.3</td><td>7.0</td><td>5.3</td><td>1.7</td><td>380.57</td></tr><tr><td>11<sub>0,11</sub> → 10<sub>0,10</sub></td><td>786282.9<sup>b</sup></td><td>...</td><td>6.5</td><td>4.5</td><td>7.6</td><td>228.32</td></tr></tbody></table><table><thead><tr><th colspan="8">o-H<sub>2</sub>O</th></tr><tr><th>Transition<br>J<sub>J<sub>K<sub>u</sub>-1,K<sub>u+1</sub></sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>Main</td><td>1<sub>1,0</sub> → 1<sub>0,1</sub></td><td>556935.64</td><td>6.2</td><td>7.2</td><td>7.8</td><td>51.9</td><td>26.73</td></tr><tr><td>Wing</td><td>1<sub>1,0</sub> → 1<sub>0,1</sub></td><td>556939.86</td><td>1.4</td><td>4.9</td><td>34.3</td><td>52.1</td><td>26.73</td></tr><tr><td>Main</td><td>5<sub>3,2</sub> → 4<sub>4,1</sub></td><td>620704.48</td><td>0.5</td><td>5.3</td><td>2.0</td><td>1.1</td><td>697.84</td></tr><tr><td>Wing</td><td>5<sub>3,2</sub> → 4<sub>4,1</sub></td><td>620704.48</td><td>...</td><td>...</td><td>...</td><td>...</td><td>697.84</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th></th><th>Transition<br>J<sub>J<sub>K<sub>-1</sub>K<sub>+1</sub></sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td colspan="8"><strong>o-H<sub>2</sub>O</strong></td></tr><tr><td>Main</td><td>3<sub>1,2</sub> → 3<sub>0,3</sub></td><td>1097364.47</td><td>1.5</td><td>7.1</td><td>5.1</td><td>8.2</td><td>215.2</td></tr><tr><td>Wing</td><td>3<sub>1,2</sub> → 3<sub>0,3</sub></td><td>1097371.43</td><td>2.0</td><td>5.2</td><td>14.8</td><td>31.2</td><td>215.2</td></tr><tr><td>Main</td><td>3<sub>1,2</sub> → 2<sub>2,1</sub></td><td>1153127.12</td><td>1.6</td><td>6.9</td><td>5.3</td><td>8.9</td><td>215.203</td></tr><tr><td>Wing</td><td>3<sub>1,2</sub> → 2<sub>2,1</sub></td><td>1153133.21</td><td>2.6</td><td>5.3</td><td>19.2</td><td>53.7</td><td>215.2</td></tr><tr><td>Main</td><td>3<sub>2,1</sub> → 3<sub>1,2</sub></td><td>1162913.04</td><td>2.9</td><td>6.6</td><td>4.3</td><td>13.4</td><td>271.01</td></tr><tr><td>Wing</td><td>3<sub>2,1</sub> → 3<sub>1,2</sub></td><td>1162914.76</td><td>1.4</td><td>6.2</td><td>18.6</td><td>28.4</td><td>271.01</td></tr><tr><td colspan="8"><strong>p-H<sub>2</sub>O</strong></td></tr><tr><td>Main</td><td>2<sub>1,1</sub> → 2<sub>0,2</sub></td><td>752033.42</td><td>5.5</td><td>6.9</td><td>5.8</td><td>33.6</td><td>136.94</td></tr><tr><td>Wing</td><td>2<sub>1,1</sub> → 2<sub>0,2</sub></td><td>752034.00</td><td>2.5</td><td>6.7</td><td>21.8</td><td>58.8</td><td>136.94</td></tr><tr><td>Main</td><td>4<sub>2,2</sub> → 3<sub>3,1</sub></td><td>916174.82</td><td>0.3</td><td>5.9</td><td>6.9</td><td>2.0</td><td>454.34</td></tr><tr><td>Wing</td><td>4<sub>2,2</sub> → 3<sub>3,1</sub></td><td>916174.82</td><td>...</td><td>...</td><td>...</td><td>...</td><td>454.34</td></tr><tr><td>Main</td><td>2<sub>0,2</sub> → 1<sub>1,1</sub></td><td>987927.13</td><td>6.1</td><td>6.9</td><td>7.5</td><td>48.6</td><td>100.85</td></tr><tr><td>Wing</td><td>2<sub>0,2</sub> → 1<sub>1,1</sub></td><td>987938.36</td><td>2.4</td><td>3.5</td><td>26.2</td><td>66.2</td><td>100.85</td></tr><tr><td>Main</td><td>1<sub>1,1</sub> → 0<sub>0,0</sub></td><td>1113349.92</td><td>1.9</td><td>5.1</td><td>4.5</td><td>9.1</td><td>53.43</td></tr><tr><td>Wing</td><td>1<sub>1,1</sub> → 0<sub>0,0</sub></td><td>1113352.60</td><td>1.8</td><td>4.4</td><td>22.3</td><td>42.8</td><td>53.43</td></tr><tr><td>Main</td><td>4<sub>2,2</sub> → 4<sub>1,3</sub></td><td>1207638.86</td><td>0.3</td><td>7.0</td><td>13.6</td><td>4.2</td><td>454.34</td></tr><tr><td>Wing</td><td>4<sub>2,2</sub> → 4<sub>1,3</sub></td><td>1207638.86</td><td>...</td><td>...</td><td>...</td><td>...</td><td>454.34</td></tr><tr><td>Main</td><td>2<sub>2,0</sub> → 2<sub>1,1</sub></td><td>1228791.19</td><td>1.2</td><td>6.4</td><td>5.4</td><td>7.2</td><td>195.91</td></tr><tr><td>Wing</td><td>2<sub>2,0</sub> → 2<sub>1,1</sub></td><td>1228791.19</td><td>...</td><td>...</td><td>...</td><td>...</td><td>195.91</td></tr><tr><td></td><td>1<sub>1,0,0</sub> → 1<sub>0,1,0</sub></td><td>547676.36</td><td>0.2</td><td>7.0</td><td>5.6</td><td>1.43</td><td></td></tr><tr><td colspan="8"><strong>HDO</strong></td></tr><tr><td>Main</td><td>2<sub>0,2</sub> → 1<sub>1,1</sub></td><td>490597.00</td><td>0.2</td><td>6.8</td><td>3.9</td><td>0.7</td><td>66.43</td></tr><tr><td>Wing</td><td>1<sub>1,0</sub> → 1<sub>1,1</sub></td><td>509293.66</td><td>0.3</td><td>6.3</td><td>3.4</td><td>1.0</td><td>46.76</td></tr><tr><td>Wing</td><td>2<sub>1,1</sub> → 2<sub>0,2</sub></td><td>599927.69</td><td>0.2</td><td>6.5</td><td>2.9</td><td>0.7</td><td>95.23</td></tr><tr><td colspan="8"><strong>HCl</strong></td></tr><tr><td>Main</td><td>1<sub>1,5</sub> → 0<sub>1,5</sub></td><td>625901.60</td><td>2.1</td><td>7.8</td><td>4.4</td><td>9.9</td><td>30.04</td></tr><tr><td>Wing</td><td>1<sub>2,5</sub> → 0<sub>1,5</sub></td><td>625918.76</td><td>2.8</td><td>7.9</td><td>4.1</td><td>12.0</td><td>30.04</td></tr><tr><td>Wing</td><td>1<sub>0,5</sub> → 0<sub>1,5</sub></td><td>625932.01</td><td>1.4</td><td>7.9</td><td>4.7</td><td>7.0</td><td>30.04</td></tr><tr><td colspan="8"><strong>H<sup>37</sup>Cl</strong></td></tr><tr><td>Main</td><td>1<sub>1,5</sub> → 0<sub>1,5</sub></td><td>624962.48</td><td>1.0</td><td>8.3</td><td>3.1</td><td>3.1</td><td>29.99</td></tr><tr><td>Wing</td><td>1<sub>2,5</sub> → 0<sub>1,5</sub></td><td>624975.93</td><td>1.4</td><td>8.1</td><td>3.8</td><td>5.5</td><td>29.99</td></tr><tr><td>Wing</td><td>1<sub>0,5</sub> → 0<sub>1,5</sub></td><td>624986.44</td><td>0.6</td><td>8.8</td><td>5.4</td><td>3.6</td><td>29.99</td></tr><tr><td colspan="8"><strong>HCN</strong></td></tr><tr><td>Main</td><td>6 → 5</td><td>531716.10</td><td>7.4</td><td>7.1</td><td>5.4</td><td>43.0</td><td>89.32</td></tr><tr><td>Wing</td><td>6 → 5</td><td>531718.60</td><td>0.5</td><td>6.0</td><td>25.3</td><td>14.0</td><td>89.32</td></tr><tr><td>Main</td><td>7 → 6</td><td>620303.70</td><td>5.1</td><td>7.2</td><td>5.3</td><td>28.4</td><td>119.09</td></tr><tr><td>Wing</td><td>7 → 6</td><td>620305.69</td><td>0.8</td><td>5.9</td><td>17.1</td><td>14.3</td><td>119.09</td></tr><tr><td>Main</td><td>8 → 7</td><td>708876.27</td><td>2.5</td><td>7.4</td><td>5.2</td><td>13.8</td><td>153.11</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">HCN</th></tr><tr><th></th><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>Wing</td><td>8 → 7</td><td>708878.31</td><td>0.9</td><td>6.2</td><td>16.0</td><td>15.0</td><td>153.11</td></tr><tr><td>Main</td><td>9 → 8</td><td>797432.27</td><td>0.9</td><td>7.6</td><td>4.9</td><td>4.9</td><td>191.38</td></tr><tr><td>Wing</td><td>9 → 8</td><td>797435.00</td><td>0.8</td><td>6.3</td><td>13.5</td><td>11.2</td><td>191.38</td></tr><tr><td>Main</td><td>10 → 9</td><td>885969.75</td><td>0.6</td><td>7.4</td><td>5.7</td><td>3.9</td><td>233.9</td></tr><tr><td>Wing</td><td>10 → 9</td><td>885973.43</td><td>0.6</td><td>6.3</td><td>16.0</td><td>10.2</td><td>233.9</td></tr><tr><td>Main</td><td>11 → 10</td><td>974486.55</td><td>0.6</td><td>6.5</td><td>5.5</td><td>3.5</td><td>280.67</td></tr><tr><td>Wing</td><td>11 → 10</td><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td><td>280.67</td></tr><tr><td>Main</td><td>13 → 12</td><td>1151448.54</td><td>0.5</td><td>5.9</td><td>6.2</td><td>3.0</td><td>386.95</td></tr><tr><td>Wing</td><td>13 → 12</td><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td><td>386.95</td></tr></tbody></table><table><thead><tr><th colspan="8">H<sup>13</sup>CN</th></tr><tr><th></th><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td></td><td>6 → 5</td><td>517969.24</td><td>0.4</td><td>7.3</td><td>5.0</td><td>2.1</td><td>87.01</td></tr><tr><td></td><td>7 → 6</td><td>604266.38</td><td>0.2</td><td>7.8</td><td>7.5</td><td>1.7</td><td>116.01</td></tr></tbody></table><table><thead><tr><th colspan="8">HNC</th></tr><tr><th></th><th>Transition<br>J<sub>K<sub>u</sub>K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td></td><td>6<sub>0,0</sub> → 5<sub>0,0</sub></td><td>543897.76</td><td>1.2</td><td>7.0</td><td>4.2</td><td>5.4</td><td>91.37</td></tr><tr><td></td><td>7<sub>0,0</sub> → 6<sub>0,0</sub></td><td>634510.41</td><td>0.5</td><td>7.2</td><td>4.5</td><td>2.2</td><td>121.82</td></tr></tbody></table><table><thead><tr><th colspan="8">HCO<sup>+</sup></th></tr><tr><th></th><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td></td><td>6 → 5</td><td>535061.20</td><td>15.3</td><td>7.2</td><td>5.5</td><td>90.3</td><td>89.88</td></tr><tr><td></td><td>7 → 6</td><td>624208.34</td><td>13.8</td><td>7.0</td><td>5.7</td><td>83.7</td><td>119.84</td></tr><tr><td></td><td>8 → 7</td><td>713341.48</td><td>10.5</td><td>6.9</td><td>5.3</td><td>59.4</td><td>154.08</td></tr><tr><td></td><td>9 → 8</td><td>802458.39</td><td>7.4</td><td>6.9</td><td>5.2</td><td>41.0</td><td>192.59</td></tr><tr><td></td><td>10 → 9</td><td>891558.14</td><td>5.6</td><td>6.7</td><td>5.2</td><td>31.2</td><td>235.38</td></tr><tr><td></td><td>11 → 10</td><td>980636.88</td><td>4.2</td><td>6.9</td><td>5.3</td><td>23.8</td><td>282.44</td></tr><tr><td></td><td>12 → 11</td><td>1069695.54</td><td>2.5</td><td>6.5</td><td>5.2</td><td>14.0</td><td>333.78</td></tr><tr><td></td><td>13 → 12</td><td>1158729.89</td><td>1.6</td><td>6.3</td><td>4.7</td><td>7.9</td><td>389.39</td></tr><tr><td></td><td>14 → 13</td><td>1247737.53</td><td>0.9</td><td>6.4</td><td>5.0</td><td>5.0</td><td>449.27</td></tr></tbody></table><table><thead><tr><th colspan="8">H<sup>13</sup>CO<sup>+</sup></th></tr><tr><th></th><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td></td><td>6 → 5</td><td>520460.32</td><td>1.1</td><td>6.7</td><td>3.9</td><td>4.6</td><td>87.43</td></tr><tr><td></td><td>7 → 6</td><td>607175.53</td><td>0.7</td><td>6.7</td><td>3.7</td><td>2.7</td><td>116.57</td></tr><tr><td></td><td>8 → 7</td><td>693877.57</td><td>0.4</td><td>6.4</td><td>3.4</td><td>1.6</td><td>149.87</td></tr><tr><td></td><td>9 → 8</td><td>780563.19</td><td>0.2</td><td>6.9</td><td>5.5</td><td>1.3</td><td>187.33</td></tr></tbody></table><table><thead><tr><th colspan="8">N<sub>2</sub>H<sup>+</sup></th></tr><tr><th></th><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td></td><td>6 → 5</td><td>558967.76</td><td>2.7</td><td>6.3</td><td>0.1</td><td>7.2</td><td>93.9</td></tr><tr><td></td><td>7 → 6</td><td>652097.23</td><td>2.7</td><td>6.3</td><td>0.0</td><td>6.7</td><td>125.19</td></tr><tr><td></td><td>8 → 7</td><td>745211.80</td><td>1.6</td><td>6.3</td><td>0.1</td><td>3.7</td><td>160.96</td></tr></tbody></table>
<table><caption>**Table 4**
(Continued)</caption><thead><tr><th colspan="8">N<sub>2</sub>H<sup>+</sup></th></tr><tr><th>Transition<br>J</th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV<br>(K km s<sup>-1</sup>)</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>9 → 8</td><td>838309.70</td><td>0.9</td><td>6.2</td><td>0.2</td><td>1.8</td><td>201.19</td></tr><tr><td>10 → 9</td><td>931388.75</td><td>0.5</td><td>6.0</td><td>0.3</td><td>1.3</td><td>245.89</td></tr></tbody><thead><tr><th colspan="8">NH<sub>3</sub></th></tr><tr><th>Transition</th><th>Frequency</th><th>T<sub>A</sub></th><th>V<sub>LSR</sub></th><th>ΔV<sub>FWHM</sub></th><th>∫T<sub>A</sub>dV</th><th>E<sub>u</sub></th></tr></thead><tbody><tr><td>N<sub>K,v</sub></td><td>MHz</td><td>(K)</td><td>(km s<sup>-1</sup>)</td><td>(km s<sup>-1</sup>)</td><td>(K km s<sup>-1</sup>)</td><td>(K)</td></tr><tr><td>Main</td><td>1<sub>0,0</sub> → 0<sub>0,1</sub></td><td>572498.04</td><td>3.3</td><td>7.1</td><td>5.9</td><td>20.8</td><td>27.48</td></tr><tr><td>Wing</td><td>1<sub>0,0</sub> → 0<sub>0,1</sub></td><td>572496.26</td><td>0.2</td><td>7.5</td><td>12.0</td><td>2.1</td><td>27.48</td></tr><tr><td>Absorption</td><td>2<sub>1,1</sub> → 1<sub>1,0</sub></td><td>1215245.71</td><td>-0.7</td><td>6.5</td><td>5.1</td><td>-3.9</td><td>80.45</td></tr></tbody><thead><tr><th colspan="8">NO</th></tr><tr><th>Transition<br>N<sub>A,F1F2</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>6<sub>-1,5,5,5,5</sub> → 5<sub>1,4,5,4,5</sub></td><td>551187.85</td><td>0.3</td><td>6.7</td><td>4.6</td><td>1.5</td><td>84.15</td></tr><tr><td>6<sub>1,5,5,4,5</sub> → 5<sub>-1,4,5,3,5</sub></td><td>551533.80</td><td>0.3</td><td>7.1</td><td>4.8</td><td>1.4</td><td>84.25</td></tr><tr><td>6<sub>1,6,5,6,5</sub> → 6<sub>-1,5,5,5,5</sub></td><td>651433.16</td><td>0.3</td><td>6.8</td><td>5.8</td><td>1.7</td><td>115.42</td></tr><tr><td>6<sub>-1,6,5,5,5</sub> → 6<sub>1,5,5,4,5</sub></td><td>651773.27</td><td>0.4</td><td>6.9</td><td>4.3</td><td>1.7</td><td>115.53</td></tr></tbody><thead><tr><th colspan="8">SO</th></tr><tr><th>Transition<br>N<sub>J</sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>4<sub>3</sub> → 1<sub>2</sub></td><td>504676.68</td><td>0.1</td><td>6.8</td><td>3.8</td><td>0.5</td><td>28.68</td></tr><tr><td>12<sub>11</sub> → 11<sub>10</sub></td><td>514853.39</td><td>0.7</td><td>7.2</td><td>6.7</td><td>4.7</td><td>167.59</td></tr><tr><td>12<sub>12</sub> → 11<sub>11</sub></td><td>516335.63</td><td>0.6</td><td>7.1</td><td>7.6</td><td>5.1</td><td>174.22</td></tr><tr><td>12<sub>13</sub> → 11<sub>12</sub></td><td>517354.09</td><td>0.8</td><td>7.3</td><td>6.4</td><td>5.7</td><td>165.78</td></tr><tr><td>13<sub>12</sub> → 12<sub>11</sub></td><td>558087.15</td><td>0.4</td><td>7.3</td><td>5.9</td><td>2.4</td><td>194.37</td></tr><tr><td>13<sub>13</sub> → 12<sub>12</sub></td><td>559319.68</td><td>0.4</td><td>7.0</td><td>6.6</td><td>2.7</td><td>201.07</td></tr><tr><td>13<sub>14</sub> → 12<sub>13</sub></td><td>560178.46</td><td>0.5</td><td>7.1</td><td>5.7</td><td>2.7</td><td>192.66</td></tr><tr><td>14<sub>13</sub> → 13<sub>12</sub></td><td>601257.88</td><td>0.4</td><td>7.3</td><td>9.6</td><td>3.7</td><td>223.23</td></tr><tr><td>14<sub>14</sub> → 13<sub>13</sub></td><td>602291.95</td><td>0.3</td><td>7.5</td><td>9.0</td><td>3.2</td><td>229.97</td></tr><tr><td>14<sub>15</sub> → 13<sub>14</sub></td><td>603021.65</td><td>0.4</td><td>7.0</td><td>8.2</td><td>3.5</td><td>221.61</td></tr><tr><td>5<sub>4</sub> → 2<sub>3</sub></td><td>611551.86</td><td>0.1</td><td>7.3</td><td>3.7</td><td>0.4</td><td>38.58</td></tr><tr><td>15<sub>14</sub> → 14<sub>13</sub></td><td>644377.53</td><td>0.3</td><td>7.7</td><td>9.0</td><td>3.3</td><td>254.15</td></tr><tr><td>15<sub>15</sub> → 14<sub>14</sub></td><td>645253.67</td><td>0.3</td><td>7.6</td><td>9.0</td><td>2.8</td><td>260.94</td></tr><tr><td>15<sub>16</sub> → 14<sub>15</sub></td><td>645874.95</td><td>0.3</td><td>7.5</td><td>10.5</td><td>3.8</td><td>252.6</td></tr><tr><td>16<sub>15</sub> → 15<sub>14</sub></td><td>687457.56</td><td>0.3</td><td>7.1</td><td>12.6</td><td>3.4</td><td>287.15</td></tr><tr><td>16<sub>16</sub> → 15<sub>15</sub></td><td>688204.39</td><td>0.2</td><td>7.1</td><td>10.5</td><td>2.7</td><td>293.97</td></tr><tr><td>16<sub>17</sub>|→15<sub>16</sub></td><td>688733.81</td><td>0.3</td><td>7.8</td><td>14.9</td><td>4.0</td><td>285.66</td></tr><tr><td>17<sub>16</sub> → 16<sub>15</sub></td><td>730500.26</td><td>0.3</td><td>7.2</td><td>7.5</td><td>2.2</td><td>322.2</td></tr></tbody><thead><tr><th colspan="8">SO<sub>2</sub></th></tr><tr><th>Transition<br>N<sub>K<sub>a</sub>,K<sub>c</sub></sub></th><th>Frequency<br>MHz</th><th>T<sub>A</sub><br>(K)</th><th>V<sub>LSR</sub><br>(km s<sup>-1</sup>)</th><th>ΔV<sub>FWHM</sub><br>(km s<sup>-1</sup>)</th><th>∫T<sub>A</sub>dV</th><th>E<sub>u</sub><br>(K)</th></tr></thead><tbody><tr><td>13<sub>3,11</sub> → 12<sub>2,10</sub></td><td>484270.75</td><td>0.2</td><td>7.1</td><td>4.0</td><td>0.6</td><td>105.83</td></tr><tr><td>7<sub>4,4</sub> → 6<sub>3,3</sub></td><td>491933.52</td><td>0.1</td><td>7.7</td><td>5.4</td><td>0.8</td><td>65.01</td></tr><tr><td>12<sub>3,9</sub> → 11<sub>2,10</sub></td><td>494779.07</td><td>0.2</td><td>7.4</td><td>3.3</td><td>0.7</td><td>93.96</td></tr></tbody></table>

Note. Superscript “b” means it is a blended line and excluded.

the CDMS and JPL websites). The centroid frequency of the fitted Gaussian profile is listed in the second column. $T_A$ and $V_{LSR}$ are, respectively, the observed antenna temperature and centroid velocity of the corresponding Gaussian fit. $\Delta V_{FWHM}$ is the “Full Width Half Maximum,” and $\int T_A dV$ (km s$^{-1}$) is the integrated line intensity.

Note that Gaussian fitting was performed on each line separately (i.e., we did not utilize a single set of Gaussian parameters to fit all transitions simultaneously). This implies that each transition of a given species can have slightly different $V_{LSR}$ and $\Delta V_{FWHM}$. This effect is best demonstrated using methanol as an example, since it has the largest number of
<figure><img src="image_11.png" /><figcaption>**Figure 9.** One-component LTE modeling for ¹³CO. The black histogram shows the data. Resulting model spectra are shown in red. LTE model parameters are provided in Table 5.</figcaption></figure>

transitions. The mean values of $V_{LSR}$ and $\Delta V_{FWHM}$ for methanol A and E combined is $6.6 \pm 0.3 \text{ km s}^{-1}$ and $4.7 \pm 0.9 \text{ km s}^{-1}$, respectively, where the errors are the $1\sigma$ standard deviations about the mean. The calculated scatter about the mean, however, is an intensity dependent parameter. Figures 11 and 12 plot $V_{LSR}$ and $\Delta V_{FWHM}$ versus $T_A (>5\sigma)$ for all the fitted methanol A and E transitions in Table 4, and clearly show that the scatter in

both fitted parameters decreases with increasing $T_A$. For transitions with $T_A < 0.5$ K, $\langle V_{LSR} \rangle = 6.59 \pm 0.39 \text{ km s}^{-1}$ and $\langle \Delta V_{FWHM} \rangle = 4.99 \pm 0.92 \text{ km s}^{-1}$. Whereas, for transitions with $T_A > 0.5$ K, $\langle V_{LSR} \rangle = 6.57 \pm 0.23 \text{ km s}^{-1}$ and $\langle \Delta V_{FWHM} \rangle = 4.39 \pm 0.67 \text{ km s}^{-1}$. This suggests that most of the observed scatter in these parameters is not due to the emission itself but it is due to our Gaussian fitting procedure,
<figure><img src="image_12.png" /><figcaption>**Figure 10.** Two component LTE modeling for HCN. The black histogram shows the data. Models of the narrow and the broad components are shown by the red and blue lines respectively. The superposition of the two components is shown in green. LTE model parameters are provided in Table 6.</figcaption></figure>

which clearly is subject to larger errors for weaker lines. This behavior is predicted by Porter et al. (2004) who show that the error in $V_{LSR}$ and $\Delta V_{FWHM}$ from Gaussian fitting increases with decreasing signal-to-noise. The green and the blue lines in Figures 11 and 12 denote, respectively, the $1\sigma$ and $3\sigma$ theoretical error envelope. These were calculated from Equation (A.1) in Porter et al. (2004) assuming $\langle\Delta V_{FWHM}\rangle \sim 5 \text{ km s}^{-1}$ and

$T_{\text{rms}} \sim 0.1 \text{ K}$ (typical values for methanol) and illustrate this effect quite clearly.

HIFI data obtained in beam switching mode generally provide quite a good measure of the continuum. Therefore, in each band, we have integrated the emission over the entire frequency range to obtain the line+continuum emission. Summation over the integrated intensities, listed in Table 4, of all the transitions in
<table><caption>**Table 5**
LTE Modeling Results for Species Requiring One-component Fits</caption><thead><tr><th></th><th>N (cm<sup>-2</sup>)</th><th>T<sub>ex</sub> (K)</th><th>ΔV<sub>FWHM</sub> (km s<sup>-1</sup>)</th><th>ΔΩ (")</th><th>V<sub>LSR</sub> (km s<sup>-1</sup>)</th></tr></thead><tbody><tr><td>[C I]</td><td>1.0 ± 0.2 × 10<sup>18</sup></td><td>48.3 ± 8.8</td><td>4.2</td><td>64.9 ± 14.7</td><td>7.8</td></tr><tr><td>[C II]</td><td>1.4 to 1.9 × 10<sup>18</sup></td><td>200.0 to 500.0</td><td>4.3</td><td>90.0</td><td>8.4</td></tr><tr><td>CCH</td><td>8.9 ± 2.1 × 10<sup>14</sup></td><td>36.5 ± 5.9</td><td>4.1 ± 0.1</td><td>65.7 ± 12.1</td><td>7.2 ± 0.0</td></tr><tr><td>CH</td><td>1.8 ± 0.4 × 10<sup>14</sup></td><td>37.7 ± 15.2</td><td>4.2 ± 0.3</td><td>69.8 ± 8.1</td><td>8.0 ± 0.0</td></tr><tr><td>CH<sup>+</sup></td><td>2.9 to 4.2 × 10<sup>13</sup></td><td>30.0 to 300.0</td><td>4.6</td><td>90.0</td><td>8.0</td></tr><tr><td>CN</td><td>2.6 ± 1.3 × 10<sup>14</sup></td><td>29.1 ± 3.9</td><td>4.3 ± 0.1</td><td>67.6 ± 7.8</td><td>7.6</td></tr><tr><td><sup>13</sup>CO</td><td>1.4 ± 0.4 × 10<sup>17</sup></td><td>88.8 ± 14.4</td><td>4.2 ± 0.7</td><td>79.6 ± 7.8</td><td>7.1</td></tr><tr><td>C<sup>18</sup>O</td><td>3.5 ± 0.5 × 10<sup>16</sup></td><td>61.9 ± 1.6</td><td>3.9 ± 0.0</td><td>69.3 ± 13.3</td><td>7.1</td></tr><tr><td>C<sup>17</sup>O</td><td>1.4 ± 0.4 × 10<sup>16</sup></td><td>53.3 ± 1.9</td><td>3.6</td><td>64.7 ± 19.9</td><td>7.2 ± 0.0</td></tr><tr><td><sup>13</sup>C<sup>18</sup>O</td><td>8.1 ± 1.6 × 10<sup>14</sup></td><td>54.3 ± 1.3</td><td>4.5</td><td>62.6 ± 12.0</td><td>7.1</td></tr><tr><td>DCN</td><td>4.9 ± 1.9 × 10<sup>12</sup></td><td>38.1 ± 5.4</td><td>6.1 ± 0.2</td><td>60.4 ± 15.4</td><td>7.0</td></tr><tr><td>DCO<sup>+</sup></td><td>2.4 ± 1.3 × 10<sup>12</sup></td><td>39.9 ± 2.3</td><td>3.0 ± 0.1</td><td>54.0 ± 15.3</td><td>6.7</td></tr><tr><td>H<sub>2</sub>CS</td><td>6.2 ± 0.7 × 10<sup>13</sup></td><td>85.0 ± 2.8</td><td>4.5</td><td>68.0 ± 11.0</td><td>6.7</td></tr><tr><td>HCl</td><td>1.6 ± 0.6 × 10<sup>14</sup></td><td>32.2 ± 5.5</td><td>3.9 ± 0.1</td><td>52.5 ± 24.1</td><td>7.4</td></tr><tr><td>H<sup>37</sup>Cl</td><td>6.7 ± 3.4 × 10<sup>13</sup></td><td>52.5 ± 15.6</td><td>3.7</td><td>53.3 ± 27.1</td><td>7.6</td></tr><tr><td>HNC</td><td>2.4 ± 0.3 × 10<sup>13</sup></td><td>28.2 ± 1.1</td><td>4.3 ± 0.1</td><td>67.2 ± 3.0</td><td>7.3</td></tr><tr><td>H<sup>13</sup>CO<sup>+</sup></td><td>7.1 ± 1.8 × 10<sup>12</sup></td><td>39.7 ± 1.3</td><td>3.8 ± 0.0</td><td>58.6 ± 14.4</td><td>7.0</td></tr><tr><td>N<sub>2</sub>H<sup>+</sup></td><td>1.6 ± 0.5 × 10<sup>13</sup></td><td>46.6 ± 1.9</td><td>2.6 ± 0.0</td><td>57.9 ± 17.2</td><td>6.3</td></tr><tr><td>NO</td><td>0.3 to 1.1 × 10<sup>16</sup></td><td>20.0 to 200.0</td><td>5.8</td><td>90.0</td><td>7.2</td></tr><tr><td>SO<sub>2</sub></td><td>1.5 ± 0.1 × 10<sup>14</sup></td><td>141.3 ± 8.4</td><td>6.7 ± 0.1</td><td>64.9 ± 9.6</td><td>7.5</td></tr></tbody></table>

Having a finite probability to accept a new position even if the $\chi^2$ is worse, ensures that we do not converge directly to a local minimum, but instead forces better sampling of the full parameter space. The code runs with several initial random states, and usually, when the variance among different clusters of states is smaller than the variance of each cluster, it is assumed to have converged to the correct solution (Hastings 1970; Roberts et al. 1997). When the code approaches convergence, it calculates a number of models and $\chi^2$ values in a tight cluster surrounding the “best” solution. This allows us to calculate a median value for each fitted parameter and its statistical standard deviation, which are listed in Table 5.

Despite the fact that we identify all transitions above $3\sigma$, for our modeling, we only utilize transitions above $5\sigma$, while neglecting the blended lines. However, when exploring the validity of our models, we also investigate frequency regions where potential transitions of the selected species exist in the molecular line databases, but were not detected above $3\sigma$. This ensures that our models do not produce synthetic spectra where no transitions are actually observed. At the beginning of the procedure, we usually let all five parameters vary. However, we were frequently able to find good solutions for the $V_{LSR}$, and FWHM after the first convergence of the code. Therefore, on subsequent runs, we fixed the $V_{LSR}$ and FWHM and allowed the other three parameters to vary. This significantly speeds up the computational time of subsequent runs. Once we obtain a good fit, we run the code 5 to 10 more times to ensure that different runs converge to the same solution within the error bars. In some cases, after running the code 5 to 10 times, the scatter of the converged solutions is larger than the standard deviation of any of the individual solutions. In this case, in Tables 5 and 6, we report the average of the multiple runs (i.e., we take the median value of each run and compute the average between runs) and the standard deviation of the solutions about this new average. In all cases, we let the source size ($\Omega$) vary up to $90''$, twice that of the largest HIFI beam (~45''). However, if the source size is larger than the largest beam, it is essentially unconstrained (though there is some sensitivity to source sizes

that are larger than the beam since the beam is Gaussian in shape and not a tophat profile). In such cases, the source is simply considered to be extended in nature. Table 5 provides the results of our MCMC $\chi^2$ fitting of the spectral lines listed in Table 4 (i.e., those with $S/N > 5\sigma$). Column 1 is the species, column 2 lists the median total column density of the species and the standard deviation, column 3 is the excitation temperature, column 4 is the FWHM line width, column 5 is the source size ($\Omega$), and column 6 is the median LSR velocity. In cases where the error is not listed, the parameter was fixed in the MCMC fitting routine. Table 5 shows that the column density uncertainties range from 10% to 50%. To ensure that our assumption of LTE is valid, we ran the same MCMC fitting procedure using the non-LTE (RADEX) models implemented in CASSIS for a handful of species ($N_2H^+$, $SO_2$, $^{13}$CO, and DCO$^+$). In all cases, the non-LTE column densities are consistent and within the reported error bars of the LTE models, as shown in Table 5. Given that the errors in Table 5 are the statistical uncertainties on the LTE solutions, to account for the possibility that LTE is not always a good approximation, we suggest that uncertainties on the high side of this range are probably appropriate.

Figure 9 provides an example of one-component modeling for $^{13}$CO. The apparent shift in centroid velocity between the data (black histogram) and the LTE model (red Gaussian curve) is seen in a number of species and can also be seen by comparing the tabulated $V_{LSR}$ listed in Tables 4 and 5. These apparent shifts of a few tenths of a km s$^{-1}$ are caused by the fact that the spectral lines are not perfectly Gaussian in shape; in some cases, this is possibly due to optical depth effects. In addition, the MCMC routine optimizes a number of free parameters to obtain the best overall physical model that fits all spectral lines simultaneously; as opposed to the Gaussian fitting routine, which simply fits a mathematical Gaussian profile to each spectral line separately. Thus, the median $V_{LSR}$ and $\Delta V_{FWHM}$ determined from the LTE modeling may not perfectly match the actual $V_{LSR}$ and $\Delta V_{FWHM}$ of any individual transition.
<table><caption>**Table 6**
LTE Modeling Results for Species Requiring Two Component Fits</caption><thead><tr><th></th><th>N<sub>1</sub> (cm<sup>-2</sup>)</th><th>T<sub>ex1</sub> (K)</th><th>ΔV<sub>FWHM1</sub> (km s<sup>-1</sup>)</th><th>ΔΩ<sub>1</sub> (′′)</th><th>V<sub>LSR1</sub><br>(km s<sup>-1</sup>)</th><th>N<sub>2</sub> (cm<sup>-2</sup>)</th><th>T<sub>ex2</sub> (K)</th><th>ΔV<sub>FWHM2</sub> (km s<sup>-1</sup>)</th><th>ΔΩ<sub>2</sub> (′′)</th><th>V<sub>LSR2</sub><br>(km s<sup>-1</sup>)</th></tr><tr><th></th><th colspan="5">Narrow Component</th><th colspan="4">Broad Component</th></tr></thead><tbody><tr><td>CS</td><td>6.5 ± 1.9 × 10<sup>14</sup></td><td>36.5 ± 1.5</td><td>4.1</td><td>66.8 ± 10.8</td><td>7.2</td><td>7.3 ± 1.4 × 10<sup>13</sup></td><td>108.3 ± 2.4</td><td>9.5 ± 0.5</td><td>34.5 ± 8.2</td><td>7.0</td></tr><tr><td><sup>13</sup>CS<sup>a</sup></td><td>1.4 ± 0.3 × 10<sup>13</sup></td><td>36.5</td><td>4.1</td><td>74.0 ± 13.6</td><td>7.2</td><td>1.6 ± 0.2 × 10<sup>12</sup></td><td>109.6 ± 1.3</td><td>9.5</td><td>34.5</td><td>7.0</td></tr><tr><td>C<sup>34</sup>S<sup>a</sup></td><td>4.5 ± 0.7 × 10<sup>13</sup></td><td>34.5</td><td>4.1</td><td>60.5 ± 8.9</td><td>7.2</td><td>3.9 ± 0.2 × 10<sup>12</sup></td><td>111.5 ± 3.5</td><td>9.5</td><td>34.5</td><td>7.0</td></tr><tr><td>o-H<sub>2</sub>S</td><td>1.0 ± 0.2 × 10<sup>15</sup></td><td>24.5 ± 0.7</td><td>3.6</td><td>66.1 ± 14.1</td><td>7.0</td><td>1.3 ± 0.2 × 10<sup>14</sup></td><td>85.8 ± 18.3</td><td>8.8 ± 1.2</td><td>39.9 ± 8.1</td><td>7.2</td></tr><tr><td>p-H<sub>2</sub>S</td><td>9.4 ± 1.5 × 10<sup>14</sup></td><td>24.3 ± 1.1</td><td>3.6</td><td>65.4 ± 13.5</td><td>7.0</td><td>1.5 ± 0.2 × 10<sup>14</sup></td><td>74.7 ± 9.9</td><td>7.4 ± 1.1</td><td>52.5 ± 10.5</td><td>7.1 ± 0.1</td></tr><tr><td>H<sup>34</sup>S<sup>a</sup></td><td>3.2 ± 0.6 × 10<sup>13</sup></td><td>25.1 ± 0.5</td><td>3.6</td><td>51.7 ± 7.7</td><td>7.0</td><td>3.0 ± 0.7 × 10<sup>12</sup></td><td>94.0 ± 15.1</td><td>9.0 ± 0.7</td><td>48.6 ± 10.0</td><td>7.2</td></tr><tr><td>o-H<sub>2</sub>CO</td><td>1.5 ± 0.2 × 10<sup>14</sup></td><td>47.7 ± 4.3</td><td>4.0</td><td>69.3 ± 7.2</td><td>6.7</td><td>3.8 ± 0.6 × 10<sup>13</sup></td><td>153.6 ± 15.0</td><td>9.0 ± 0.3</td><td>47.7 ± 10.0</td><td>7.2 ± 0.2</td></tr><tr><td>p-H<sub>2</sub>CO</td><td>2.0 ± 0.4 × 10<sup>14</sup></td><td>44.8 ± 3.0</td><td>4.0 ± 0.1</td><td>75.2 ± 10.7</td><td>6.7</td><td>6.7 ± 1.6 × 10<sup>13</sup></td><td>163.0 ± 27.2</td><td>9.0 ± 1.0</td><td>46.0 ± 9.3</td><td>7.3 ± 0.2</td></tr><tr><td>HCN</td><td>2.2 ± 0.4 × 10<sup>14</sup></td><td>34.3 ± 5.0</td><td>4.4</td><td>64.4 ± 6.5</td><td>7.2</td><td>4.8 ± 0.1 × 10<sup>13</sup></td><td>66.8 ± 5.2</td><td>13.4 ± 0.6</td><td>41.1 ± 6.2</td><td>6.6 ± 0.1</td></tr><tr><td>H<sup>13</sup>CN</td><td>5.1 ± 0.7 × 10<sup>12</sup></td><td>30.5 ± 1.2</td><td>4.4</td><td>74.8 ± 7.4</td><td>7.2</td><td>3.6 ± 1.9 × 10<sup>12</sup></td><td>79.1 ± 7.8</td><td>11.0 ± 0.4</td><td>37.0 ± 10.8</td><td>6.6</td></tr><tr><td>HCO<sup>+</sup></td><td>7.7 ± 0.7 × 10<sup>13</sup></td><td>68.9 ± 1.8</td><td>4.3</td><td>74.8 ± 8.2</td><td>7.0</td><td>1.5 ± 0.4 × 10<sup>13</sup></td><td>69.5 ± 4.9</td><td>12.0 ± 0.8</td><td>40.1 ± 12.1</td><td>7.1 ± 0.1</td></tr><tr><td>NH<sub>3</sub> p & o</td><td>1.4 ± 0.3 × 10<sup>14</sup></td><td>20.0</td><td>4.2</td><td>80.3 ± 5.0</td><td>7.0</td><td>8.4 ± 5.4 × 10<sup>13</sup></td><td>35.8 ± 2.4</td><td>10.0</td><td>34.9 ± 11.2</td><td>7.2</td></tr><tr><td>SO</td><td>1.0 ± 0.4 × 10<sup>15</sup></td><td>33.7 ± 5.0</td><td>3.8 ± 0.5</td><td>60.2 ± 17.8</td><td>6.8 ± 0.2</td><td>2.1 ± 1.1 × 10<sup>14</sup></td><td>121.8 ± 13.6</td><td>10.7 ± 0.5</td><td>34.8 ± 8.9</td><td>7.2 ± 0.3</td></tr></tbody></table>

**Note.**

<footnote><sup>a</sup> Calculation based on the main isotopologue.</footnote>
<figure><img src="image_13.png" /><figcaption>**Figure 14.** Mean $V_{LSR}$ for each species derived from the Gaussian fits (Table 4). Red triangles indicate the mean $V_{LSR}$ for species fit by a single Gaussian component. In cases requiring two component Gaussian fits, the narrow component is indicated by blue circle and the broad component is indicated by a green square. Error bars reflect the range in fitted $V_{LSR}$ values provided in Table 4.</figcaption></figure>

Although one-component modeling usually results in a remarkably good fit to the observations (e.g., C$^{18}$O, CH, CCH, etc), there are some cases in which a second (broad) component is necessary to properly reproduce the observations. This is independent of the broad-line wings seen in the transitions of some species that required a two component Gaussian fitting as mentioned in Section 2.3. In some cases, even species that were well fit by a single Gaussian component required two component LTE modeling, one with a narrow line width, and the other with a broad line. This is because, in these cases, there is no single combination of model parameters (notably $T_{ex}$ and $N_{tot}$) that could reproduce the intensities of all transitions simultaneously. The two component LTE modeling implementation in CASSIS uses a two slab model; from the perspective of the observer, component 1 is the front slab and component 2 is the slab located behind it. The code allows component 1 to absorb emission from component 2. The results of the two component MCMC LTE modeling are listed in Table 6. Figure 10 provides an example of a species for which two component modeling was required. To see if this could be the result of non-LTE effects, we also attempted to model these species using the RADEX code (van der Tak et al. 2007) as implemented in CASSIS. For the RADEX modeling, we used the identical parameter range as for the LTE modeling. RADEX, however, invokes one additional free parameter, namely the H$_2$ volume density, which we allowed to range from $10^2$ to $10^{10}$ cm$^{-3}$. In all cases, the RADEX modeling was unable to produce a good fit to all transitions unless a second physical component was included.

Note that $^{12}$CO is not presented in either Tables 5 or 6 due to the presence of self-absorption from foreground material, which complicated the modeling procedure. We do, however, model the broad shock/outflow component separately for the analysis presented in Section 3.3.2.

## 3.2. Comments on Individual Species

The detected species listed in Table 2 can be related to a variety of physical processes that exist in the ISM, such as shocks, UV irradiation by nearby OB stars, and hot-core

chemistry. In this section, we discuss some specific molecules in the context of these physical processes.

### 3.2.1. Tracers of UV Irradiation

Given the high UV flux in the Orion-S region ($\chi = 1.1 \times 10^5 \chi_0$; Herrmann et al. 1997), it is not surprising that we detect a wide variety of UV tracers.

[C1] and [CII]: [C1] and [CII] are the fine-structure lines of neutral atomic and singly ionized carbon. Both have been seen over large regions of the ISM. [C1] is known to trace PDRs at the UV illuminated surfaces of GMCs (Tielens & Hollenbach 1985; Plume et al. 1999; Papadopoulos et al. 2004), and [CII] is a tracer of the interface between the diffuse warm ionized medium and the outermost surface of GMCs (Velusamy et al. 2012). [CII] is also thought to be a tracer of CO “dark gas” (Langer et al. 2010). We have detected all [C1] and [CII] transitions accessible to HIFI, i.e., both of the [C1] ground-state fine-structure transitions: $^3P_1 \rightarrow ^3P_0$ and $^3P_2 \rightarrow ^3P_1$ ($V_{LSR} \sim 7.5$ km s$^{-1}$), and the single [CII] transition: $^2P_{3/2} \rightarrow P_{1/2}$ ($V_{LSR} \sim 8.6$ km s$^{-1}$), toward Orion-S. With only one transition of [CII], we modeled the column density assuming that the excitation temperature in the PDR was between 200 and 500 K. The velocity of [CII] is considerably different from the velocity of the dense, quiescent cloud component of Orion-S as traced by C$^{18}$O, CS, DCO$^+$, HCO$^+$, etc. (e.g., ~7 km s$^{-1}$; see Figure 14). This suggests that [CII] is tracing a kinematically distinct component of Orion-S; most likely photoevaporating material moving away from the molecular clump surfaces (e.g., Goicoechea et al. 2015). However, [CII] does not have a velocity that is dramatically different from the quiescent cloud component and is, in fact, similar to that of C$^{18}$O (Figure 14). This is probably due to the fact that neutral atomic carbon exists slightly deeper in the cloud ($A_V > 3-4$), where it is still mixed with molecular material (see, e.g., Hollenbach & Tielens 1997; Mookerjea et al. 2012).

CH$^+$, CH, and CCH: CH$^+$, CH, and CCH are often associated with PDRs, with the former two also being tracers of “CO-dark molecular gas” (Gerin et al. 2010; Nagy et al. 2013). In addition, CH$^+$ and SH$^+$ can form via turbulent chemistry in the diffuse ISM (Godard et al. 2012). Transitions above $5\sigma$ detected toward Orion-S for these species are listed in Table 4. Enough transitions of CH and CCH were detected above $5\sigma$ that we could model the emission from these species (Table 5), both of which were well fit by 1 component models. For CH$^+$, we provide a range of column densities for a range of excitation temperatures between 30 and 200 K. From the Gaussian fits in Table 4, both CH and CH$^+$ have similar kinematics ($V_{LSR} > 8.0$ km s$^{-1}$), whereas the CCH has $V_{LSR} \sim 7.2$ km s$^{-1}$ (see Figure 14). This suggests that CH and CH$^+$ trace the same region as the [CII] emission, i.e., the UV illuminated surface of the cloud, though possibly a deeper and denser region of the PDR, as suggested by Pan et al. (2001). CCH, which has a velocity closer to that of the quiescent gas, likely arises from deeper layers in the cloud (Nagy et al. 2015). The formation pathways for these species may help clarify these velocity differences. For example, CH$^+$ forms by an endothermic reaction: $C^+ + H_2 \rightarrow CH^+ + H$ (Federman et al. 1996). The formation of CH follows after a hydrogen abstraction reaction with CH$^+$ forming CH$^+_2$ and a subsequent dissociative recombination. Since these two species are closely linked to the C$^+$ abundance through one or two steps in the reaction
network, it makes sense that they would be linked physically and, therefore, kinematically. The formation of CCH, however, involves additional steps in the reaction chain, starting with the formation of $C_2H_2^+$ followed by dissociative recombination to form CCH (e.g., Wootten et al. 1980). Since this requires additional reactions involving molecular material, this species is probably more closely linked to the denser molecular gas.

**SH⁺ and CO⁺:** SH⁺ and CO⁺ are also species thought to trace regions with enhanced UV fields (Nagy et al. 2013). We detect two weak (<5σ) hyperfine components of SH⁺ in Orion-S, which are too weak to be fitted or modeled but which, interestingly, are seen in emission rather than the usual absorption line profiles seen in the diffuse ISM (Godard et al. 2012). Although we do not report the Gaussian fit parameters of SH⁺ or CO⁺ due to the weakness of the transitions, an inspection of their lines suggests $V_{LSR}$ of ~8.5 km s⁻¹, which is virtually identical to the [C II] velocity. Although SH⁺ can form via turbulent chemistry in the diffuse ISM, given the strength of the UV field in Orion-S, it is likely that the main formation pathway is S⁺ + H₂ → SH⁺ + H. Therefore, like [C II], SH⁺ probably also originates in the PDR at the surface of the cloud. The same is true of CO⁺, which has a similar $V_{LSR}$ (8.5 km s⁻¹) as SH⁺ and [C II], and, like CH⁺, forms directly from C⁺ via the reaction OH + C⁺ → CO⁺ + H.

**CN and HCN:** CN and HCN have both been detected in Orion-S. While both molecules are good tracers of warm dense gas, the CN/HCN abundance ratio is suggested to be an indirect measure of the UV field (e.g., Fuente et al. 1993); i.e., if the ratio is significantly larger than 1, then the UV field is thought to be enhanced. We have identified the $N = 5–4$, $N = 6–5$, and $N = 7–6$ transitions of CN above the 5σ noise level toward Orion-S and have modeled these transitions using a narrow component (see Table 5). The transitions of HCN ($J = 6–5$ to 13–12), however, exhibit the characteristic broad-line wings that required two component Gaussian fitting and LTE modeling (see Table 6). Figure 10 shows the LTE model fit to our HCN observations. Since the fits are constrained by the rms noise in each spectrum, the higher frequency transitions (which tend to have much larger noise) appear to be less well fit than the lower frequency/lower noise transitions. They are, however, still acceptable fits to the data within the given noise levels. Comparing the CN column density with the narrow component of HCN, we obtain a CN/HCN abundance ratio of 1.2 ± 0.6, indicating a moderately enhanced UV field. Given the high critical densities of these transitions (≥10⁸ cm⁻³) it is unlikely that they originate at the UV illuminated cloud surface. Instead, both their critical densities and the CN/HCN abundance ratio of 1.2 suggest that they arise deeper in the cloud (around $A_V > 5$; Fuente et al. 1993) and, therefore, are more closely associated with the dense molecular gas. This is also borne out by their velocities, which are similar to the dense, quiescent cloud component (Figure 14).

### 3.2.2. Complex Organic Molecules and Precursors

Complex organic molecules are often associated with hot-core chemistry. Unlike Orion-KL in which a plethora of complex organic molecules were detected (Crockett et al. 2014), in Orion-S, we only detect a handful of molecules that might be considered complex.

**CH₃OH:** methanol is an asymmetric top molecule, whose internal rotation results in two distinct symmetry species A–CH₃OH and E–CH₃OH. In total, we observed 359 methanol

transitions above 3σ toward Orion-S, 170 A–CH₃OH, and 189 E–CH₃OH. 198 of the lines were above the 5σ noise level, 111 A–CH₃OH and 87 E–CH₃OH. While methanol is known to be a good temperature probe (e.g., Beuther et al. 2005; Wang et al. 2011), detailed modeling of methanol is beyond the scope of this paper and will be the subject of future work.

**H₂CO:** formaldehyde is another commonly used tracer of gas temperature (e.g., Mangum & Wootten 1993), in which the two hydrogen atom spins separate the molecule into distinct ortho and para species. Transitions of H₂CO above the 5σ noise level are listed in Table 4. We needed two component LTE modeling for both the ortho and para H₂CO molecules since one-component models could not simultaneously reproduce all observed transitions. The modeling (Table 6) results in low temperatures for the narrow component ($T_{ex} \sim 45–50$ K) and higher temperatures ($T_{ex} \sim 150–165$ K) for the broad component. The large line widths and the fact that the estimated source sizes are quite large (>45′′) may indicate that the high-temperature H₂CO emission arises from shocks in the outflows rather than from a “hot-core” region. Ortho to para ratios in the narrow and broad components are 0.8 ± 0.1 and 0.6 ± 0.1 respectively. These low values are also consistent with our results for H₂S (see below). The spin temperatures associated with the ortho and para species are 7 ± 1 K and 6 ± 1 K respectively, suggesting that if formaldehyde formed under LTE conditions, the formation temperature was very low.

**CH₃OCH₃:** dimethyl ether is a complex molecule detected toward Orion-S. Since this molecule has no transition above 5σ, we only report it as a detection in Table 2.

The lack of complex organic molecules suggests that, if hot cores exist in Orion-S, they are still in their infancy and have not had time to either expand dynamically or develop chemically. This is not surprising given the very small size of the embedded submillimeter continuum sources detected in the region (Zapata et al. 2005). In addition, if these submillimeter continuum sources are indeed hot cores they are approximately 10 times smaller than the Orion-KL hot core. Therefore, the beam dilution in Orion-S would be 100 times worse. Thus, any transitions arising from the Orion-KL hot core that have an intensity of less than a few kelvin in the survey of Crockett et al. (2014) would be undetectable in our survey if they originate from the considerably smaller region in Orion-S. Alternatively, it is possible that Orion-S is not a massive star-forming region at all and, therefore, there are no hot cores in this region. Observations with higher spatial resolution or at lower frequencies (with associated lower excitation temperatures) would help address this issue by revealing the presence of more complex organics.

### 3.2.3. Pure Shock Tracers

**SiO:** SiO abundances can be enhanced by more than two orders of magnitude in hot and shocked regions (e.g., Iglesias & Silk 1978; Martin-Pintado et al. 1992) and SiO emission is often used as a tracer of molecular outflows since the SiO emission traces the outflow material itself, rather than the dense protostellar core (Martin-Pintado et al. 1992). This is believed to be due to Si-bearing dust grains being shattered by the outflow, followed by a rapid gas-phase reaction with free oxygen to produce SiO (e.g., Schilke et al. 1997b; Gusdorf et al. 2008a, 2008b). A number of outflows have already been identified in Orion-S by Zapata et al. (2006). In our data, although we could not identify any SiO emission above the 5σ
level, we have identified three SiO transitions above the 3σ level (J = 12–11, 13–12, 14–13, v = 0) at a velocity of 6.2 km s⁻¹ (similar to the quiescent gas). With additional spectral smoothing (to a velocity resolution of ~4 km s⁻¹) it is clear that these transitions are real, with S/N > 5σ. These transitions are quite broad (ΔV ~ 20–30 km s⁻¹), which is reasonable considering the observed characteristics of the SiO outflows, as seen by Zapata et al. (2006). Given the existence of such high-J transitions with excitation energies above ~150 K, this indicates the presence of at least a small amount of hot shocked SiO in Orion-S.

### 3.2.4. Tracers of Quiescent Gas

**CO, ¹³CO, C¹⁸O, C¹⁷O, and ¹³C¹⁸O:** for all carbon monoxide isotopologues, excluding ¹²C¹⁶O itself, one-component Gaussian fitting and LTE modeling match the observations remarkably well. ¹²C¹⁶O itself, however, exhibits a broad-line wing (clearly tracing an outflow/shock) and, due to the presence of self-absorption, was not modeled. The existence of an outflow is not visible in any of the ¹²C¹⁶O isotopologue transitions due to their lower abundances. The LTE modeling of ¹³CO is shown in Figure 9. For all ¹²C¹⁶O isotopologues (except ¹³C¹⁸O), we see transitions from J = 5–4 to 11–10 above the 3σ level. For ¹³C¹⁸O the highest transition we detect above 3σ is J = 7–6. The higher J transitions are buried in the larger noise of the higher frequency HIFI bands. For ¹²C¹⁶O, however, we detect lines up to J = 16–15. For the isotopologues, the typical V<sub>LSR</sub> is approximately 7 km s⁻¹, indicating that these species trace the quiescent gas in the cloud. The V<sub>LSR</sub> of the main isotopologue, however, is often a bit higher than this, probably due to the Gaussian fits being skewed by the presence of self-absorption in the spectra, or due to the fact that, with its high opacity, ¹²C¹⁶O may be tracing a different physical region of the cloud. Interestingly, in Table 5, a correlation can be seen between the CO isotopologues and the derived excitation temperature; with the more optically thick species, which trace the cloud surface (e.g., ¹³CO), having a higher temperature than the optically thin ones, which preferentially trace the interior (e.g., ¹³C¹⁸O). This suggests that the external UV field is responsible for much of the heating in Orion-S (see also Tauber & Goldsmith 1990). This is different than the usual case of isolated star formation, in which the gas is predominantly heated internally by the process of gravitational collapse and the formation of an embedded protostar.

**Deuterium-bearing Molecules:** deuterated species are a subject of considerable interest in the ISM, since the D/H ratio in molecular clouds can be considerably enhanced over the cosmic value of ~10⁻⁵. In Orion-S, we detect only a few deuterated species: DCN, DCO⁺, and HDO, which all have velocities similar to that of the quiescent gas. Enhanced deuteration can occur because fractionation reactions involving deuterium are favored in low-temperature environments associated with pre-stellar cores, the resultant deuterated molecules can freeze onto grains, and then be released back into the gas phase when star-formation activity begins to heat the natal gas (e.g., Ceccarelli et al. 2007, p. 47). Thus, deuterated species, such as DCN and HDO, can trace the chemical history of the gas. In Orion-S, we found the DCN/HCN column density ratio to be 0.02 ± 0.01, suggesting considerable enhancement in cold gas. The DCO⁺/HCO⁺ column density ratio is 0.03 ± 0.02. While the DCO⁺

abundance can be enhanced in cold gas via H₂D⁺, Parise et al. (2009) have shown that deuteration can also occur in the gas phase of warm regions, like the Orion Bar via the CH₂D⁺ ion. Although we detected three HDO transitions, it was the only species for which we were not able to find any models that converged to a good solution. Therefore, there is no way to give even a rough estimate for the D/H ratio in water.

N₂H⁺: while N₂H⁺, J = 1–0, is often associated with cold, dense gas, we detect N₂H⁺ transitions from J = 6–5 to 10–9. LTE modeling indicates excitation temperatures of ~47 K, suggesting that even the dense gas in Orion-S is quite warm. Previous observations of CH₃C₂H in Orion-S (Bergin et al. 1994) confirm this idea. The V<sub>LSR</sub> of N₂H⁺ (Figure 14) also suggests that it originates from the quiescent gas. The upper limit for the column density of N₂D⁺ with the same excitation condition as that found for N₂H⁺ is 5 × 10¹¹ cm⁻². This provides a rough estimate of the D/H ratio of <0.03.

### 3.2.5. Tracers of Both Shocked and Quiescent Gas

As previously mentioned, there are a number of species, for which we had to invoke two component LTE modeling in order to fit the observed transitions (see Table 6). Narrow spectral components are usually associated with quiescent gas, whereas broader spectral components trace more dynamic gas that is often associated with shocks. This suggests that species listed in Table 6 can simultaneously exist in both quiescent and shocked gas components. This is not surprising, since Bachiller & Pérez Gutiérrez (1997) show that, in the bipolar outflow L1157, while some species are clearly quiescent gas tracers, many species exist in both components. Of these latter species, their abundances in the shocked gas are often an order of magnitude or more higher than their abundances in the quiescent gas. We will explore the issue of abundances further in Section 3.3.2. Here, however, we will briefly discuss some of the species listed in Table 6 as possible tracers of both shocked and quiescent gas.

**H₂O:** while H₂O is not listed in Table 6, it is an important molecule in the ISM and has been the subject of a number of important studies using the Herschel Space Observatory in both shocked and unshocked gas. Both the ortho and para forms of H₂O were detected in Orion-S, as well as one transition of o-H₂¹⁸O. The H₂O transitions required two component Gaussian fitting due to the presence of a broad-line wing in the spectra (Table 4). The modeling of water is a complex affair and is beyond the scope of this paper. However, Choi et al. (2014) modeled the ortho and para H₂¹⁸O in Orion-S and found LTE column densities of 2 × 10¹¹ cm⁻² and 2 × 10¹² cm⁻², respectively, which suggests an ortho to para ratio of 0.1, indicating that it is unlikely that water formed under LTE conditions. Their non-LTE analysis of the data, however, brings the ratio up to a factor of two. Choi et al. (2014) also show that the ortho to para ratio is ~0.3 in the nearby Orion Bar. Both values are well below the usual value of three, which indicates a non-LTE formation mechanism for water in both Orion-S and the Bar, possibly due to photodesorption from dust grains.

**H₂S and H₂³⁴S:** H₂S is an asymmetric rotor that has ortho and para spin modifications. It is considered to be a tracer of high-temperature grain surface chemistry (e.g., Watson & Walmsley 1982). Similar to SO, despite the fact that we fit the H₂S transitions with a single Gaussian in Table 4, H₂S also required a second physical component in order to obtain a good