<figure><img src="image_30.png" /><figcaption>**Figure 26.** Same as Fig. 22 with the prediction for the dark matter clustering at $z \lesssim 1$ (dashed line). The shaded regions enclose the expected dark matter clustering between redshift $z = 1$ (lower envelope) and 0 (upper envelope) while the dashed lines themselves correspond to the expectation at $z = 0.5$. These predictions were obtained from the dark matter power spectrum provided by CAMB (Lewis, Challinor & Lasenby 2000), with (thick dashed lines and dark shaded regions) and without (thin dashed lines and light shaded regions) using the non-linear corrections of Smith et al. (2003), for our adopted cosmological parameters and $\sigma_8 = 0.8$. See Section 8.2.6 for further details.</figcaption></figure>

### 8.2.6 Dark matter halo masses hosting H I systems and galaxies

It is common practice to compare the observed clustering amplitudes of extragalactic objects (e.g. galaxies, galaxy clusters, IGM absorbers, etc.) with that of the expected theoretical (cold) dark matter in a given cosmological framework, in order to infer a typical dark matter halo mass for the confinement of such objects (e.g. Mo et al. 1993; Ryan-Weber 2006). This method is model dependent, and it is only applicable over narrow cosmological epochs (narrow redshift ranges).

Our sample is composed of objects at $0 \lesssim z \lesssim 1$, which corresponds to about half of the history of the Universe. Thus, a direct link between the clustering amplitudes reported in this paper with a single dark matter halo mass is not meaningful. Still, simple reasoning leads to the conclusion that the typical dark matter haloes for the confinement of H I systems and galaxies, should follow the same trends as the amplitudes of their correlation functions. Therefore, the most massive ones should correspond to ‘non-SF’ galaxies, followed by ‘SF’ galaxies, ‘strong’ H I systems (both comparable) and ‘weak’ H I systems, in that same order.

Fig. 26 is the same as Fig. 22 but including the prediction for the dark matter clustering at $z \lesssim 1$ (thick dashed line). The shaded regions enclose the expected dark matter clustering between redshift $z = 1$ (lower envelope) and 0 (upper envelope), while the dashed lines correspond to the expectation at $z = 0.5$. These predictions

were obtained from the dark matter power spectrum<fnref n="25" /> provided by CAMB<fnref n="26" /> (Lewis et al. 2000), with (thick dashed lines and dark shaded regions) and without (thin dashed lines and light shaded regions) the non-linear corrections of Smith et al. (2003), for our adopted cosmological parameters and $\sigma_8 = 0.8$. We see that the shape of the correlations for ‘strong’ H I systems and galaxies are approximately consistent with that of the predicted dark matter in the non-linear regime. Their somewhat larger amplitudes hint towards ‘absolute biases’ $b \gtrsim 1$. On the other hand, the shape of the ‘weak’ H I is marginally in disagreement with that of the dark matter expectation in the non-linear regime. In this case, the lower amplitude compared to that of the dark matter hints towards an ‘absolute bias’ $b < 1$. We note that for the case of ‘weak’ systems, a linear approximation for the dark matter clustering (i.e. neglecting the correction of Smith et al. 2003), gives a somewhat better match in terms of slopes, although still with amplitudes marginally above our observed ones. If a significant fraction of ‘weak’ H I systems reside in underdense regions (i.e. within galaxy voids), a linear evolution should be expected even at $z \approx 0$. We speculate that H I systems within galaxy voids are still evolving in the linear regime, even at scales $\lesssim 2$ Mpc.

<footnote n="25">²⁵ Note that the power spectrum is the Fourier transform of the correlation function (and vice versa).</footnote>

<footnote n="26">²⁶ www.camb.info</footnote>
In view of these results, we revisit the claim by Ryan-Weber (2006) that H I absorption systems with $\lesssim 10^{15}$ cm$^{-2}$ reside preferentially in dark matter halo of masses $M \sim 10^{13.6}-10^{14.5} h^{-1}_{100} M_{\odot}$, analogous to those of massive galaxy groups. Given the significantly lower clustering amplitude of our full sample of H I systems compared to that of galaxies, we conclude that H I absorption systems are preferentially found in dark matter haloes of masses smaller than those populated by galaxies. At most, ‘SF’ galaxies and ‘strong’ H I systems are typically found in dark matter haloes of similar masses. Moreover, a significant fraction of ‘weak’ H I systems might reside in underdense regions with ‘absolute biases’ $b < 1$.

### 8.2.7 Three types of relationships between H I and galaxies

We have reported a significant ($>3\sigma$ c.l.) rejection of the hypothesis that H I absorption systems and galaxies (as a whole) trace the same underlying dark matter distribution linearly (see Section 7). We have found that this is mostly driven by H I absorption systems with column densities $N_{H I} < 10^{14}$ cm$^{-2}$ (‘weak’ systems), which show little (consistent with 0) correlation with galaxies. On the other hand, H I systems with $N_{H I} \ge 10^{14}$ cm$^{-2}$ (‘strong’ systems) are consistent with such a hypothesis. Thus, this indicates the presence of, at least, two types of relationships between H I and galaxies: (i) linear correlation and (ii) no correlation.

A third type of relationship comes from the fact that at small enough scales, H I systems and galaxies are a different manifestation of the same physical object; a galaxy is also a very strong H I absorption system and, depending on the galaxy definition, the other way around also applies. Our survey was not designed for studying scales $\lesssim 0.5$ Mpc, and so it is not surprising that we do not observe a characteristic signal of a one-to-one association (see Section 6.4). Thus, we cannot neglect the fact that this relationship exists and should be included in our interpretation. Still, the contribution of this one-to-one correlation between H I absorption systems and luminous galaxies to the total fraction of H I systems at $10^{13} \lesssim N_{H I} \lesssim 10^{17}$ cm$^{-2}$ is quite low.

This picture fits well with what was presented early by Mo & Morris (1994), and is in contrast to the commonly adopted interpretation presented by Lanzetta et al. (1995) which claims that the majority of low-$z$ H I systems belong to the extended haloes of luminous galaxies.

## 8.3 Prospects and future work

In this section, we will enumerate some of the projects that are directly linked to our current study, but that we have not performed here either because of lack of observational data or limited time. We aim to address them in the near future.

### 8.3.1 Comparison with simulations

Even though many of our results are in good agreement with those presented by Pierleoni et al. (2008, see Section 8.1.3), others have not been properly compared with the predictions from simulations yet. For instance, one of our key results is the fact that ‘weak’ H I systems and galaxies cluster more weakly than ‘weak’ H I systems with themselves, or than galaxies with themselves. As discussed in Section 8.2.3, this would imply that ‘weak’ H I systems and luminous galaxies do not trace the same underlying matter distribution linearly. It is still to be seen if current cosmological hydrodynamical simulations can reproduce this and all our observational results.

### 8.3.2 Cosmological evolution

A complete picture of the relationship between the IGM and galaxies requires understanding not only their statistical connection at a given epoch, but also their cosmological evolution. Combining our results with those from higher redshifts ($z \sim 2-3$; e.g. Adelberger et al. 2003, 2005; Crighton et al. 2011; Rakic et al. 2012; Rudie et al. 2012; Tummuangpak et al. 2013), such an evolution can be studied. It is important to keep in mind that: (i) galaxy samples in these high-$z$ studies are strongly biased against ‘non-SF galaxies’, and (ii) the lower the redshift, the higher the (average) overdensity traced by a fixed $N_{H I}$ limit (e.g. Schaye 2001; Davé et al. 2010, see equation 37). Thus, any evolutionary analysis has to properly take into account such differences.

We also note that because of observational limitations, the redshift range between $z \sim 1$ and 2 is currently unexplored for studies of the IGM–galaxy connection. This is a very important cosmological time, as it is when the star formation density starts to decline (e.g. Hopkins & Beacom 2006). We hope this will be covered in the near future.

### 8.3.3 Dependence on H I Doppler parameter

In our current analysis, we have completely ignored the information provided by the Doppler parameters of the H I systems. Current hydrodynamical simulations suggest that above a limit of $b_{H I} \sim 50$ km s$^{-1}$, an important fraction of H I lines trace the warm–hot intergalactic medium (WHIM; e.g. Davé et al. 2010, see their fig. 11). The WHIM is currently the best candidate to host the majority of the ‘missing baryons’ at low-$z$ (e.g. Cen & Ostriker 1999; Davé et al. 2010; Shull et al. 2012; Tepper-García et al. 2012). However, because of their expected large $b_{H I}$ and low $N_{H I}$ ($\lesssim 10^{13}$ cm$^{-2}$), its direct observation through H I has been extremely difficult. In fact, H I can appear undetectable in such conditions (Savage et al. 2010). Still, the H I–galaxy cross-correlation could provide an indirect way to observe the WHIM by splitting the samples by $b_{H I}$, and applying a similar reasoning as that presented in Section 8.2.4.

### 8.3.4 Cross-correlations for the CGM

Our current statistical results seem adequate for constraining the H I–galaxy connection on scales $\sim 0.5–10$ Mpc. An obvious improvement would be to increase the galaxy completeness level at scales $\lesssim 0.5$ Mpc. In this way, the two-point correlation function results can be directly linked to the studies of the CGM based on one-to-one absorber–galaxy associations (e.g. Prochaska et al. 2011b; Tumlinson et al. 2011; Thom et al. 2012; Stocke et al. 2013; Werk et al. 2013). Correlations between metals and galaxies will also provide a useful complement for such studies. Similarly, a better characterization of the galaxies (e.g. stellar masses, specific star formation rates, morphology, etc.) in these samples will allow us to isolate their relative contributions (and hence importance) to the observed correlation amplitudes.

### 8.3.5 ‘Extremely weak’ H I systems

Our current data quality is not high enough to observe ‘extremely weak’ H I systems ($N_{H I} \lesssim 10^{13}$ cm$^{-2}$), but studying the H I–galaxy cross-correlation at such low column densities is clearly worth exploring. There is strong observational evidence that the vast majority of these absorbers reside within galaxy voids (e.g. Manning 2002; Tejos et al. 2012). In such a case an anti-correlation between
'extremely weak' H I absorption systems and galaxies should be expected, but this has not yet been observationally confirmed (or refuted). There is also the interesting possibility that these absorbers may represent a completely different type of H I absorption systems than those found co-existing with galaxies. If true, such systems are good candidates for testing our current galaxy formation paradigm (e.g. Manning 2002, 2003).

## 9 SUMMARY

We have presented a new optical spectroscopic galaxy survey of 2143 galaxies at $z \lesssim 1$, around three fields containing five QSOs with HST UV spectroscopy.<fnref n="27" /> These galaxies were observed by optical MOS instruments such as DEIMOS, VIMOS and GMOS, and were mostly selected based on magnitude limits ($R \sim 23-24$ mag; no morphological criteria imposed). This selection also led to the detection of 423 stars and 22 AGN within those fields. Out of our new 2143 galaxies, 1777 have detectable star formation activity within their past $\sim 1$ Gyr (referred to as 'SF'), while the remaining 366 have not (referred to as 'non-SF').

We have also presented a new spectroscopic survey of 669 well-identified intervening H I absorption-line systems at $z \lesssim 1$, observed in the spectra of eight QSO at $z \sim 1$. These systems were detected in high-resolution UV HST spectroscopy from COS and FOS. Out of these 669 H I systems, 173 have column densities $10^{14} \le N_{H I} \lesssim 10^{17} \text{cm}^{-2}$ (referred to as 'strong'), while the remaining 496 have $10^{13} \lesssim N_{H I} < 10^{14} \text{cm}^{-2}$ (referred to as 'weak').

Combining these new data with previously published galaxy catalogues from the VVDS (Le Fèvre et al. 2005, 2013), GDDS (Abraham et al. 2004) and Morris & Jannuzi (2006) surveys, we have gathered a sample of 17 509 galaxies with redshifts between $0.01 < z < 1.3$, and at transverse separations $< 50$ Mpc from their respective field centres; and 654 H I absorption systems at redshifts between $0.01 < z < z_{\text{max}}$, where $z_{\text{max}}$ is the redshift corresponding to 5000 km s⁻¹ blueward of the redshift of their respective QSOs. Out of those 17 509 galaxies, 8293 were classified as 'SF' and 1743 as 'non-SF'; while out of those 654 H I systems, 165 were classified as 'strong' and 489 as 'weak'.

Using these data, we have investigated the statistical connection between the IGM and galaxies through a clustering analysis. This data set is the largest sample to date for such an analysis. We presented observational results for the H I–galaxy cross-correlation and both the galaxy–galaxy and H I–H I autocorrelations at $z \lesssim 1$. The two-point correlation functions have been measured both along and transverse to the LOS, $\xi(r_\perp, r_\parallel)$, on a linear grid of 0.5 Mpc in both directions. We have measured the H I–galaxy ($\xi_{ag}$) and galaxy–galaxy ($\xi_{gg}$) correlations at transverse scales $r_\perp \lesssim 10$ Mpc, and the H I–H I autocorrelation ($\xi_{aa}$) at transverse scales $r_\perp \lesssim 2$ Mpc. We have integrated these correlations along the LOS up to 20 Mpc, and used the projected results to infer the shape of their corresponding 'real-space' correlation functions, $\xi(r)$, assuming power laws of the form $\xi(r) = (r/r_0)^{-\gamma}$. By comparing the results from the H I–galaxy cross-correlation with the H I–H I and galaxy–galaxy autocorrelations, we have provided constraints on their statistical connection, as a function of both H I column density and galaxy star formation activity. We summarize our observational results as follows.

(i) Two-dimensional correlations, $\xi(r_\perp, r_\parallel)$.

(a) Full sample: the H I–galaxy two-dimensional cross-correlation has comparable clustering amplitudes to those of the H I–H I autocorrelation, which are lower than those of the galaxy–galaxy autocorrelation. The peaks of these correlation functions were found to be $\xi_{ag} = 2.3 \pm 0.9$, $\xi_{aa} = 2.1 \pm 0.9$ and $\xi_{gg} = 5.7 \pm 0.7$, respectively.

(b) 'Strong' H I systems and 'SF' galaxies: the H I–galaxy, H I–H I and galaxy–galaxy two-dimensional correlations all have comparable amplitudes. The peaks of these correlation functions were found to be $\xi_{ag} = 8.3 \pm 2.2$, $\xi_{aa} = 7.5 \pm 2.3$ and $\xi_{gg} = 6.1 \pm 0.6$, respectively.

(c) 'Strong' H I systems and 'non-SF' galaxies: the H I–galaxy two-dimensional cross-correlation has comparable clustering amplitudes than those of the galaxy–galaxy autocorrelation, which are marginally higher than those of the H I–H I autocorrelation. The peaks of the correlation functions were found to be $\xi_{ag} = 10.3 \pm 5.6$, $\xi_{gg} = 12.6 \pm 3.0$ and $\xi_{aa} = 7.5 \pm 2.3$, respectively.

(d) 'Weak' H I systems and 'SF' galaxies: the H I–galaxy two-dimensional cross-correlation has much lower amplitudes than those of the galaxy–galaxy and H I–H I autocorrelations. The H I–H I autocorrelation has also lower amplitudes than those of the galaxy–galaxy autocorrelation. The peaks of the correlation functions were found to be $\xi_{ag} = 0.9 \pm 0.6$, $\xi_{gg} = 6.1 \pm 0.6$ and $\xi_{aa} = 1.9 \pm 0.9$, respectively.

(e) 'Weak' H I systems and 'non-SF' galaxies: the H I–galaxy two-dimensional cross-correlation has much lower amplitudes than those of the galaxy–galaxy and H I–H I autocorrelations. The H I–H I autocorrelation has also lower amplitudes than those of the galaxy–galaxy autocorrelation. The peaks of the correlation functions were found to be $\xi_{ag} = 0.6 \pm 0.5$, $\xi_{gg} = 12.6 \pm 3.0$ and $\xi_{aa} = 1.9 \pm 0.9$, respectively.

(ii) Real-space correlations, $\xi(r) \equiv (r/r_0)^{-\gamma}$.

(a) Full sample: the H I–galaxy cross-correlation has comparable clustering amplitudes than those of the H I–H I autocorrelation, which are lower than those of the galaxy–galaxy autocorrelation. The correlation lengths and slopes are found to be $r_0^{ag} = 1.6 \pm 0.2$ Mpc and $\gamma^{ag} = 1.4 \pm 0.1$, $r_0^{aa} = 0.3 \pm 0.3$ Mpc and $\gamma^{aa} = 1.1 \pm 0.1$, and $r_0^{gg} = 3.9 \pm 0.1$ Mpc and $\gamma^{gg} = 1.7 \pm 0.1$, respectively.

(b) 'Strong' H I systems and 'SF' galaxies: the H I–galaxy, H I–H I and galaxy–galaxy correlations have all comparable amplitudes. The correlation lengths and slopes are found to be $r_0^{ag} = 3.8 \pm 0.2$ Mpc and $\gamma^{ag} = 1.7 \pm 0.1$, $r_0^{aa} = 3.1 \pm 0.7$ Mpc and $\gamma^{aa} = 1.3 \pm 0.4$, and $r_0^{gg} = 3.9 \pm 0.1$ Mpc and $\gamma^{gg} = 1.6 \pm 0.1$, respectively.

(c) 'Strong' H I systems and 'non-SF' galaxies: the H I–galaxy cross-correlation has comparable clustering amplitudes than those of the galaxy–galaxy autocorrelation, which are higher than those of the H I–H I autocorrelation. The correlation lengths and slopes found to be $r_0^{ag} = 4.0 \pm 0.3$ Mpc and $\gamma^{ag} = 1.7 \pm 0.1$, $r_0^{gg} = 6.2 \pm 0.2$ Mpc and $\gamma^{gg} = 1.6 \pm 0.1$, and $r_0^{aa} = 3.1 \pm 0.7$ Mpc and $\gamma^{aa} = 1.3 \pm 0.4$, respectively.

(d) 'Weak' H I systems and 'SF' galaxies: the H I–galaxy cross-correlation has much lower amplitudes than those of the galaxy–galaxy autocorrelation and H I–H I autocorrelations. The H I–H I autocorrelation has also lower amplitudes than those of the galaxy–galaxy autocorrelation. The correlation lengths and slopes are found to be $r_0^{ag} = 0.2 \pm 0.4$ Mpc and $\gamma^{ag} = 1.1 \pm 0.3$, $r_0^{gg} = 3.9 \pm 0.1$ Mpc and $\gamma^{gg} = 1.6 \pm 0.1$, and $r_0^{aa} = 0.3 \pm 0.1$ Mpc and $\gamma^{aa} = 1.0 \pm 0.1$,

<footnote n="27">²⁷ Note that one of the fields has three QSOs.</footnote>
respectively. We note however that a power-law fit for H I–galaxy cross-correlation might not be a good description of the observations.

(e) ‘Weak’ H1 systems and ‘SF’ galaxies: the H I–galaxy cross-correlation has much lower amplitudes than those of the galaxy–galaxy and H I–H I autocorrelations. The H I–H I autocorrelation has also lower amplitudes than those of the galaxy–galaxy autocorrelation. The correlation lengths and slopes are found to be $r_0^{ag} = 0.0 \pm 0.8$ Mpc and $\gamma^{ag} = 1.0 \pm 1.6$, $r_0^{gg} = 6.2 \pm 0.2$ Mpc and $\gamma^{gg} = 1.6 \pm 0.1$, and $r_0^{aa} = 0.3 \pm 0.1$ Mpc and $\gamma^{aa} = 1.0 \pm 0.1$, respectively. We note, however, that a power-law fit for the real-space H I–galaxy cross-correlation might not be a good description of the observations.

(iii) Amplitudes.

(a) H I–galaxy cross-correlations: the H I–galaxy cross-correlation amplitudes are systematically higher for ‘strong’ systems than for ‘weak’ systems, and are also higher for ‘non-SF’ galaxies than for ‘SF’ galaxies, with a much stronger dependence on H I column density than galaxy star formation activity. This is true for both the two-dimensional and the real-space correlations (see numbers above).

(b) *Galaxy autocorrelations*: the galaxy–galaxy autocorrelation amplitudes are systematically higher for ‘non-SF’ galaxies than for ‘SF’ galaxies. This is true for both the two-dimensional and the real-space correlations (see numbers above).

(c) *H1 autocorrelations*: the H I–H I autocorrelation amplitudes are systematically higher for ‘strong’ systems than for ‘weak’ systems. This is true for both the two-dimensional and real-space correlations (see numbers above).

(iv) Velocity distortions.

(a) The two-dimensional H I–galaxy cross-correlations do not show significant velocity distortions along the LOS, apart from those expected by the galaxy redshift uncertainties.

(b) The peak in the two-dimensional H I–galaxy cross-correlation for ‘strong’ systems and ‘non-SF’ galaxies appears shifted by ~1 Mpc along the LOS from 0, and there is marginal evidence (not significant) that this might be a real feature.

(v) Two-dimensional ratios, $(\xi_{ag})^2/(\xi_{gg}\xi_{aa})$ on scales <2 Mpc.

(a) Full sample: the ratio $(\xi_{ag})^2/(\xi_{gg}\xi_{aa})$ appears marginally inconsistent with 1.

(b) ‘Strong’ H1 systems and galaxies: the ratio $(\xi_{ag})^2/(\xi_{gg}\xi_{aa})$ appears roughly consistent (large uncertainties) with 1, irrespective of the galaxy star formation activity.

(c) ‘Weak’ H1 systems and galaxies: the ratio $(\xi_{ag})^2/(\xi_{gg}\xi_{aa})$ appears inconsistent with 1, irrespective of the galaxy star formation activity.

(vi) Projected along the LOS ratios, $(\xi_{ag})^2/(\xi_{gg}\xi_{aa})$ on scales <2 Mpc.

(a) Full sample: we find $(\xi_{ag})^2/(\xi_{gg}\xi_{aa}) \approx 0.2 \pm 0.2$. This rules out the hypothesis that H I systems and galaxies (as a whole) trace the same underlying dark matter distribution linearly, at a high statistical significance (>3σ c.l.).

(b) ‘Strong’ H1 systems and ‘SF’ galaxies: we find $(\xi_{ag})^2/(\xi_{gg}\xi_{aa}) \approx 1.1 \pm 0.6$. This is consistent (large uncertainties) with the hypothesis that ‘strong’ H I systems and ‘SF’ galaxies trace the same underlying dark matter distribution linearly.

(c) ‘Strong’ H1 systems and ‘non-SF’ galaxies: we find $(\xi_{ag})^2/(\xi_{gg}\xi_{aa}) \approx 0.5 \pm 0.3$. This marginally rules out the hypothesis that ‘strong’ H I systems and ‘non-SF’ galaxies trace the same underlying dark matter distribution linearly (only at the ~2σ c.l.).

(d) ‘Weak’ H1 systems and ‘SF’ galaxies: we find $(\xi_{ag})^2/(\xi_{gg}\xi_{aa}) \approx 0.0 \pm 0.2$. This rules out the hypothesis that ‘weak’ H I systems and ‘SF’ galaxies trace the same underlying dark matter distribution linearly, at a high statistical significance (>3σ c.l.).

(e) ‘Weak’ H1 systems and ‘non-SF’ galaxies: we find $(\xi_{ag})^2/(\xi_{gg}\xi_{aa}) \approx 0.0 \pm 0.4$. This marginally rules out the hypothesis that ‘weak’ H I systems and ‘non-SF’ galaxies trace the same underlying dark matter distribution linearly (only at the ~2σ c.l.).

(vii) ‘Absolute biases’.

(a) ‘Strong’ H1 systems and galaxies: their ‘absolute biases’ are consistent with $b \gtrsim 1$.

(b) ‘Weak’ H1 systems: their ‘absolute biases’ are consistent with $b < 1$.

Our interpretation of these results has led us to the following conclusions.

(i) The bulk of H I systems on ~Mpc scales have little velocity dispersion ($\lesssim 120$ km s⁻¹) with respect to the bulk of galaxies. Hence, no strong galaxy outflow or inflow signal is detected in our data.

(ii) The vast majority (~100 per cent) of ‘strong’ H I systems and ‘SF’ galaxies are distributed in the same locations. We have identified these locations with the ‘overdense large-scale structure’.

(iii) A fraction of ‘non-SF’ galaxies are distributed in roughly the same way as ‘strong’ H I systems and ‘SF’ galaxies but there are sublocations – within those where galaxies and ‘strong’ H I systems reside – with a much higher density of ‘non-SF’ galaxies than ‘strong’ H I systems and/or ‘SF’ galaxies. We have identified such locations as galaxy clusters. We estimated that only a 25 ± 15 per cent of ‘non-SF’ galaxies reside in galaxy clusters and that the remaining 75 ± 15 per cent co-exist with ‘strong’ H I and ‘SF’ at scales $\lesssim 2$ Mpc, following the same underlying dark matter distribution, i.e. the ‘overdense large-scale structure’.

(iv) An important fraction of ‘weak’ systems could reside in locations devoid of galaxies of any kind. We have identified such locations as galaxy voids, i.e. the ‘underdense large-scale structure’. At a limit of $N_{H1} \ge 10^{13}$ cm⁻², we have estimated that roughly ~50 per cent of ‘weak’ systems reside within galaxy voids. At lower $N_{H1}$ limits this fraction is likely to increase.

(v) The vast majority (~100 per cent) of ‘strong’ H I absorption systems at low-z reside in dark matter haloes of masses comparable to those hosting the galaxies in our sample.

(vi) At least ~50 per cent of ‘weak’ H I absorption systems with $N_{H1} \ge 10^{13}$ cm⁻² reside in dark matter haloes less massive than those hosting ‘strong’ H I systems and/or the galaxies in our sample. At lower $N_{H1}$ limits this fraction is likely to increase.

(vii) We speculate that H I systems within galaxy voids at $z \lesssim 1$ might be still evolving in the linear regime even at scales $\lesssim 2$ Mpc.

(viii) We conclude that there are *at least* three types of relationship between H I absorption systems and galaxies at low-z: (i) one-to-one physical association; (ii) association because they both follow the same underlying dark matter distribution and (iii) no association at all.
## ACKNOWLEDGEMENTS

We thank the anonymous referee for helpful comments and suggestions which improved the paper. We thank Pablo Arnalte-Mur, Rich Bielby, John Lucey, Peder Norberg and Tom Shanks for helpful discussions. We thank Pablo Arnalte-Mur for his help in obtaining the prediction for the dark matter clustering at $z \lesssim 1$. We thank Mark Swinbank for his help in the reduction of GMOS data.

We thank contributors to SciPy,<fnref n="28" /> Matplotlib<fnref n="29" /> and the PYTHON programming language<fnref n="30" />; the free and open-source community and the NASA Astrophysics Data System<fnref n="31" /> for software and services.

NT acknowledges grant support by CONICYT, Chile (PFCHA/Doctorado al Extranjero 1ª Convocatoria, 72090883). SLM was partially supported by STFC Rolling Grant PP/C501568/1 Extragalactic Astronomy and Cosmology at Durham 20082013. JB acknowledges support from HST-GO-11585.03-A and HST-GO-12264.03-A grants. ERW acknowledges support by Australian Research Council DP1095600. We also thank funding by STFC Grant ST/1001573/1.

This work was mainly based on observations made with the NASA/ESA Hubble Space Telescope under programmes GO 12264 and GO 11585, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555; and on observations collected at the European Southern Observatory, Chile, under programmes 070.A-9007, 087.A-0857 and 086.A-0970. Some of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the NASA. The authors wish also to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. This work was partially based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the NSF (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina).

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APPENDIX A: DATA TABLES

<table><caption>Table A1. H I absorption systems in QSO Q0107–025A.</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.003736 ± 0.000023</td><td>13.46 ± 0.09</td><td>30 ± 11</td><td>b</td><td>0.225685 ± 0.000010</td><td>13.61 ± 0.04</td><td>28 ± 4</td><td>a</td></tr><tr><td>0.005063 ± 0.000030</td><td>13.34 ± 0.10</td><td>37 ± 13</td><td>b</td><td>0.226208 ± 0.000004</td><td>14.20 ± 0.05</td><td>20 ± 1</td><td>a</td></tr><tr><td>0.006143 ± 0.002014</td><td>14.01 ± 9.45</td><td>47 ± 219</td><td>c</td><td>0.227170 ± 0.000003</td><td>15.79 ± 0.05</td><td>39 ± 1</td><td>a</td></tr><tr><td>0.006291 ± 0.000409</td><td>15.14 ± 6.02</td><td>31 ± 205</td><td>c</td><td>0.233799 ± 0.000009</td><td>14.25 ± 0.02</td><td>53 ± 3</td><td>a</td></tr><tr><td>0.006427 ± 0.007203</td><td>13.65 ± 55.41</td><td>34 ± 650</td><td>c</td><td>0.234228 ± 0.000011</td><td>13.70 ± 0.05</td><td>26 ± 4</td><td>a</td></tr><tr><td>0.028710 ± 0.000009</td><td>13.49 ± 0.06</td><td>19 ± 4</td><td>b</td><td>0.234812 ± 0.000009</td><td>13.99 ± 0.02</td><td>52 ± 3</td><td>a</td></tr><tr><td>0.031353 ± 0.000005</td><td>13.92 ± 0.23</td><td>14 ± 4</td><td>b</td><td>0.237463 ± 0.000008</td><td>13.93 ± 0.08</td><td>19 ± 4</td><td>a</td></tr><tr><td>0.036048 ± 0.000004</td><td>14.24 ± 0.58</td><td>14 ± 5</td><td>c</td><td>0.237666 ± 0.000026</td><td>14.03 ± 0.06</td><td>58 ± 5</td><td>a</td></tr><tr><td>0.040448 ± 0.000010</td><td>13.58 ± 0.05</td><td>21 ± 5</td><td>b</td><td>0.261209 ± 0.000066</td><td>13.40 ± 0.12</td><td>66 ± 24</td><td>a</td></tr><tr><td>0.040644 ± 0.000045</td><td>12.66 ± 0.51</td><td>12 ± 30</td><td>c</td><td>0.261648 ± 0.000006</td><td>14.56 ± 0.04</td><td>25 ± 1</td><td>a</td></tr><tr><td>0.040971 ± 0.000048</td><td>13.55 ± 0.10</td><td>73 ± 26</td><td>b</td><td>0.262838 ± 0.000019</td><td>13.36 ± 0.05</td><td>37 ± 7</td><td>a</td></tr><tr><td>0.041486 ± 0.000046</td><td>13.45 ± 0.26</td><td>24 ± 15</td><td>b</td><td>0.278142 ± 0.000012</td><td>13.15 ± 0.06</td><td>17 ± 5</td><td>a</td></tr><tr><td>0.041669 ± 0.000025</td><td>13.81 ± 0.11</td><td>25 ± 7</td><td>b</td><td>0.283496 ± 0.000012</td><td>13.05 ± 0.17</td><td>7 ± 7</td><td>a</td></tr><tr><td>0.043067 ± 0.000014</td><td>13.43 ± 0.05</td><td>37 ± 6</td><td>b</td><td>0.283819 ± 0.000024</td><td>13.17 ± 0.07</td><td>35 ± 9</td><td>a</td></tr><tr><td>0.047181 ± 0.000257</td><td>13.56 ± 0.36</td><td>108 ± 46</td><td>b</td><td>0.294791 ± 0.000011</td><td>13.88 ± 0.03</td><td>38 ± 4</td><td>a</td></tr><tr><td>0.047422 ± 0.000032</td><td>13.65 ± 0.29</td><td>51 ± 18</td><td>b</td><td>0.314305 ± 0.000039</td><td>13.73 ± 0.09</td><td>51 ± 11</td><td>a</td></tr><tr><td>0.050436 ± 0.000021</td><td>12.93 ± 0.17</td><td>9 ± 14</td><td>b</td><td>0.321329 ± 0.000027</td><td>13.13 ± 0.11</td><td>21 ± 10</td><td>a</td></tr><tr><td>0.050640 ± 0.000010</td><td>13.62 ± 0.05</td><td>22 ± 5</td><td>b</td><td>0.321883 ± 0.000060</td><td>13.35 ± 0.17</td><td>38 ± 18</td><td>a</td></tr><tr><td>0.050869 ± 0.000020</td><td>13.10 ± 0.12</td><td>17 ± 12</td><td>b</td><td>0.323119 ± 0.000010</td><td>13.92 ± 0.07</td><td>23 ± 4</td><td>a</td></tr><tr><td>0.052836 ± 0.000087</td><td>14.03 ± 0.27</td><td>74 ± 15</td><td>b</td><td>0.324347 ± 0.000027</td><td>13.57 ± 0.06</td><td>46 ± 9</td><td>a</td></tr><tr><td>0.052887 ± 0.000013</td><td>15.24 ± 2.95</td><td>22 ± 21</td><td>c</td><td>0.326839 ± 0.000023</td><td>13.38 ± 0.11</td><td>20 ± 9</td><td>a</td></tr><tr><td>0.053279 ± 0.000064</td><td>13.29 ± 0.37</td><td>33 ± 24</td><td>b</td><td>0.332783 ± 0.000021</td><td>13.87 ± 0.05</td><td>48 ± 7</td><td>a</td></tr><tr><td>0.053847 ± 0.000019</td><td>13.58 ± 0.06</td><td>44 ± 8</td><td>b</td><td>0.355193 ± 0.000016</td><td>13.32 ± 0.06</td><td>23 ± 5</td><td>a</td></tr><tr><td>0.054636 ± 0.000030</td><td>13.08 ± 0.13</td><td>25 ± 14</td><td>b</td><td>0.356902 ± 0.000012</td><td>13.52 ± 0.04</td><td>28 ± 4</td><td>a</td></tr><tr><td>0.056460 ± 0.000020</td><td>13.24 ± 0.08</td><td>30 ± 9</td><td>b</td><td>0.357912 ± 0.000016</td><td>13.27 ± 0.07</td><td>21 ± 6</td><td>a</td></tr><tr><td>0.060568 ± 0.000006</td><td>13.91 ± 0.05</td><td>26 ± 3</td><td>b</td><td>0.362997 ± 0.000011</td><td>13.36 ± 0.06</td><td>16 ± 4</td><td>a</td></tr><tr><td>0.062980 ± 0.000008</td><td>13.98 ± 0.02</td><td>55 ± 3</td><td>b</td><td>0.378044 ± 0.000033</td><td>13.40 ± 0.08</td><td>37 ± 11</td><td>a</td></tr><tr><td>0.063400 ± 0.000018</td><td>12.95 ± 0.12</td><td>14 ± 10</td><td>b</td><td>0.384703 ± 0.000008</td><td>14.78 ± 0.02</td><td>57 ± 2</td><td>a</td></tr><tr><td>0.076709 ± 0.000081</td><td>13.86 ± 0.10</td><td>139 ± 43</td><td>b</td><td>0.399072 ± 0.000038</td><td>13.41 ± 0.09</td><td>39 ± 12</td><td>a</td></tr><tr><td>0.077981 ± 0.000008</td><td>17.08 ± 0.78</td><td>20 ± 3</td><td>c</td><td>0.399501 ± 0.000008</td><td>14.29 ± 0.03</td><td>29 ± 2</td><td>a</td></tr><tr><td>0.081904 ± 0.000011</td><td>13.94 ± 0.07</td><td>30 ± 5</td><td>b</td><td>0.416608 ± 0.000022</td><td>13.90 ± 0.04</td><td>51 ± 7</td><td>a</td></tr><tr><td>0.082419 ± 0.000028</td><td>13.44 ± 0.09</td><td>36 ± 12</td><td>b</td><td>0.422987 ± 0.000029</td><td>13.34 ± 0.10</td><td>29 ± 10</td><td>a</td></tr><tr><td>0.085376 ± 0.000016</td><td>13.52 ± 0.05</td><td>37 ± 7</td><td>b</td><td>0.429110 ± 0.000108</td><td>13.52 ± 0.23</td><td>48 ± 23</td><td>a</td></tr><tr><td>0.094779 ± 0.000008</td><td>13.53 ± 0.04</td><td>21 ± 3</td><td>b</td><td>0.429535 ± 0.000079</td><td>13.95 ± 0.30</td><td>37 ± 23</td><td>a</td></tr><tr><td>0.097074 ± 0.000014</td><td>12.93 ± 0.11</td><td>10 ± 8</td><td>b</td><td>0.429852 ± 0.000063</td><td>13.85 ± 0.53</td><td>28 ± 32</td><td>c</td></tr><tr><td>0.099364 ± 0.000021</td><td>13.11 ± 0.08</td><td>28 ± 9</td><td>b</td><td>0.430079 ± 0.000184</td><td>13.33 ± 0.99</td><td>24 ± 27</td><td>c</td></tr><tr><td>0.109475 ± 0.000004</td><td>14.25 ± 0.24</td><td>19 ± 3</td><td>a</td><td>0.500464 ± 0.000025</td><td>14.11 ± 0.05</td><td>37 ± 5</td><td>a</td></tr><tr><td>0.112880 ± 0.000012</td><td>13.73 ± 0.04</td><td>35 ± 5</td><td>a</td><td>0.501734 ± 0.000021</td><td>14.29 ± 0.04</td><td>42 ± 5</td><td>a</td></tr><tr><td>0.113778 ± 0.000005</td><td>13.88 ± 0.25</td><td>12 ± 3</td><td>a</td><td>0.535635 ± 0.000387</td><td>15.05 ± 0.51</td><td>93 ± 33</td><td>c</td></tr><tr><td>0.114403 ± 0.000012</td><td>13.40 ± 0.06</td><td>24 ± 5</td><td>a</td><td>0.535674 ± 0.000010</td><td>15.01 ± 0.14</td><td>25 ± 5</td><td>a</td></tr><tr><td>0.114844 ± 0.000040</td><td>13.28 ± 0.11</td><td>54 ± 21</td><td>a</td><td>0.536282 ± 0.000237</td><td>15.17 ± 0.18</td><td>68 ± 24</td><td>a</td></tr><tr><td>0.115532 ± 0.000008</td><td>16.23 ± 0.90</td><td>25 ± 5</td><td>c</td><td>0.536483 ± 0.000011</td><td>15.61 ± 0.08</td><td>34 ± 3</td><td>a</td></tr><tr><td>0.115884 ± 0.000036</td><td>13.36 ± 0.15</td><td>27 ± 14</td><td>a</td><td>0.557532 ± 0.000015</td><td>14.81 ± 0.04</td><td>38 ± 2</td><td>a</td></tr><tr><td>0.120679 ± 0.000021</td><td>13.44 ± 0.06</td><td>45 ± 8</td><td>a</td><td>0.579023 ± 0.000031</td><td>13.75 ± 0.26</td><td>6 ± 3</td><td>a</td></tr><tr><td>0.131411 ± 0.000007</td><td>13.73 ± 0.03</td><td>31 ± 3</td><td>a</td><td>0.580353 ± 0.000043</td><td>14.00 ± 0.08</td><td>37 ± 8</td><td>a</td></tr><tr><td>0.141685 ± 0.000026</td><td>13.18 ± 0.09</td><td>34 ± 10</td><td>a</td><td>0.640255 ± 0.000026</td><td>14.24 ± 0.08</td><td>28 ± 3</td><td>a</td></tr><tr><td>0.146162 ± 0.000085</td><td>13.32 ± 0.26</td><td>43 ± 25</td><td>a</td><td>0.689857 ± 0.000029</td><td>13.97 ± 1.26</td><td>23 ± 43</td><td>c</td></tr><tr><td>0.146440 ± 0.000062</td><td>13.27 ± 0.28</td><td>33 ± 17</td><td>a</td><td>0.718065 ± 0.000048</td><td>14.06 ± 0.10</td><td>33 ± 8</td><td>a</td></tr><tr><td>0.153737 ± 0.000018</td><td>13.34 ± 0.06</td><td>32 ± 7</td><td>a</td><td>0.718936 ± 0.000006</td><td>15.63 ± 0.05</td><td>24 ± 1</td><td>a</td></tr><tr><td>0.166028 ± 0.000017</td><td>13.43 ± 0.05</td><td>45 ± 7</td><td>a</td><td>0.719266 ± 0.000280</td><td>13.90 ± 0.23</td><td>105 ± 43</td><td>a</td></tr><tr><td>0.175444 ± 0.000016</td><td>13.73 ± 0.03</td><td>67 ± 7</td><td>a</td><td>0.728135 ± 0.000022</td><td>14.38 ± 0.09</td><td>23 ± 3</td><td>a</td></tr><tr><td>0.177473 ± 0.000068</td><td>14.09 ± 0.34</td><td>30 ± 10</td><td>a</td><td>0.728846 ± 0.000028</td><td>14.41 ± 0.07</td><td>37 ± 4</td><td>a</td></tr><tr><td>0.177697 ± 0.000035</td><td>14.63 ± 0.12</td><td>34 ± 5</td><td>a</td><td>0.786457 ± 0.000032</td><td>14.28 ± 0.02</td><td>110 ± 10</td><td>a</td></tr><tr><td>0.181930 ± 0.000025</td><td>13.46 ± 0.05</td><td>58 ± 9</td><td>a</td><td>0.847815 ± 0.000042</td><td>13.85 ± 0.19</td><td>37 ± 30</td><td>a</td></tr><tr><td>0.188633 ± 0.000021</td><td>12.90 ± 0.10</td><td>20 ± 9</td><td>a</td><td>0.876337 ± 0.000021</td><td>15.93 ± 0.10</td><td>19 ± 3</td><td>a</td></tr><tr><td>0.188989 ± 0.000027</td><td>12.94 ± 0.10</td><td>30 ± 12</td><td>a</td><td>0.876569 ± 0.000125</td><td>15.30 ± 0.32</td><td>34 ± 8</td><td>a</td></tr><tr><td>0.202445 ± 0.000008</td><td>13.99 ± 0.02</td><td>49 ± 3</td><td>a</td><td>0.889633 ± 0.000045</td><td>14.53 ± 57.89</td><td>13 ± 298</td><td>c</td></tr><tr><td>0.213873 ± 0.000010</td><td>13.46 ± 0.04</td><td>25 ± 4</td><td>a</td><td>0.899105 ± 0.000156</td><td>14.20 ± 43.79</td><td>17 ± 512</td><td>c</td></tr><tr><td>0.220311 ± 0.000021</td><td>12.84 ± 0.10</td><td>18 ± 9</td><td>a</td><td>0.906513 ± 0.000047</td><td>14.72 ± 2.55</td><td>44 ± 67</td><td>c</td></tr><tr><td>0.220569 ± 0.000009</td><td>13.21 ± 0.05</td><td>17 ± 4</td><td>a</td><td>0.926727 ± 0.000056</td><td>14.32 ± 0.02</td><td>226 ± 15</td><td>a</td></tr></tbody></table>

Notes. (1) and (5): H I redshift. (2) and (6): H I column density from Voigt profile fitting. (3) and (7): H I Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) ‘secure’; (b) ‘probable’; and (c) ‘uncertain’ (see Section 4.3 for definitions). See Section 4 for further details.
<table><caption>Table A2. H<sub>I</sub> absorption systems in QSO Q0107-025B.</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.006340 ± 0.000004</td><td>14.30 ± 0.08</td><td>31 ± 3</td><td>b</td><td>0.436121 ± 0.000024</td><td>13.74 ± 0.04</td><td>62 ± 7</td><td>a</td></tr><tr><td>0.013367 ± 0.000010</td><td>13.35 ± 0.05</td><td>22 ± 5</td><td>b</td><td>0.467456 ± 0.000013</td><td>14.04 ± 0.03</td><td>44 ± 3</td><td>a</td></tr><tr><td>0.041753 ± 0.000012</td><td>13.51 ± 0.04</td><td>42 ± 6</td><td>b</td><td>0.499367 ± 0.000009</td><td>15.00 ± 0.08</td><td>30 ± 3</td><td>a</td></tr><tr><td>0.053188 ± 0.000011</td><td>13.64 ± 0.04</td><td>33 ± 5</td><td>b</td><td>0.499540 ± 0.000069</td><td>14.72 ± 0.17</td><td>57 ± 7</td><td>a</td></tr><tr><td>0.060677 ± 0.000013</td><td>13.32 ± 0.06</td><td>28 ± 6</td><td>b</td><td>0.512259 ± 0.000097</td><td>13.64 ± 0.54</td><td>22 ± 58</td><td>c</td></tr><tr><td>0.063119 ± 0.000008</td><td>13.47 ± 0.04</td><td>24 ± 3</td><td>b</td><td>0.517071 ± 0.000011</td><td>14.65 ± 0.02</td><td>44 ± 3</td><td>a</td></tr><tr><td>0.109629 ± 0.000014</td><td>13.26 ± 0.06</td><td>26 ± 6</td><td>a</td><td>0.523835 ± 0.000051</td><td>14.08 ± 0.29</td><td>44 ± 33</td><td>a</td></tr><tr><td>0.115300 ± 0.000001</td><td>13.51 ± 0.04</td><td>32 ± 4</td><td>a</td><td>0.535355 ± 0.000008</td><td>15.18 ± 0.04</td><td>29 ± 2</td><td>a</td></tr><tr><td>0.115714 ± 0.000003</td><td>14.53 ± 0.06</td><td>32 ± 1</td><td>a</td><td>0.555576 ± 0.000124</td><td>13.68 ± 1.64</td><td>26 ± 171</td><td>c</td></tr><tr><td>0.120307 ± 0.000007</td><td>13.51 ± 0.04</td><td>22 ± 3</td><td>a</td><td>0.578527 ± 0.000077</td><td>13.76 ± 0.11</td><td>33 ± 23</td><td>a</td></tr><tr><td>0.120734 ± 0.000008</td><td>13.82 ± 0.02</td><td>48 ± 3</td><td>a</td><td>0.621978 ± 0.000125</td><td>13.81 ± 2.29</td><td>26 ± 163</td><td>c</td></tr><tr><td>0.136385 ± 0.000004</td><td>13.85 ± 0.03</td><td>26 ± 2</td><td>a</td><td>0.642711 ± 0.002910</td><td>13.72 ± 1.47</td><td>184 ± 94</td><td>c</td></tr><tr><td>0.154647 ± 0.000021</td><td>15.89 ± 0.59</td><td>22 ± 2</td><td>c</td><td>0.646712 ± 0.002877</td><td>13.61 ± 10.92</td><td>16 ± 438</td><td>c</td></tr><tr><td>0.155130 ± 0.000232</td><td>13.39 ± 0.27</td><td>64 ± 16</td><td>a</td><td>0.650067 ± 0.002869</td><td>13.66 ± 25.67</td><td>12 ± 619</td><td>c</td></tr><tr><td>0.200199 ± 0.000003</td><td>15.62 ± 0.01</td><td>26 ± 1</td><td>a</td><td>0.660267 ± 0.000406</td><td>13.86 ± 2.60</td><td>13 ± 62</td><td>c</td></tr><tr><td>0.202519 ± 0.000004</td><td>14.94 ± 0.02</td><td>43 ± 1</td><td>a</td><td>0.689906 ± 0.000157</td><td>13.95 ± 19.57</td><td>16 ± 354</td><td>c</td></tr><tr><td>0.203027 ± 0.000003</td><td>14.76 ± 0.03</td><td>26 ± 1</td><td>a</td><td>0.713645 ± 0.000017</td><td>14.30 ± 0.05</td><td>24 ± 4</td><td>a</td></tr><tr><td>0.211922 ± 0.000010</td><td>13.28 ± 0.04</td><td>26 ± 4</td><td>a</td><td>0.717975 ± 0.000062</td><td>15.29 ± 0.05</td><td>47 ± 11</td><td>a</td></tr><tr><td>0.226692 ± 0.000003</td><td>14.97 ± 0.04</td><td>28 ± 1</td><td>a</td><td>0.718402 ± 0.000108</td><td>14.82 ± 0.14</td><td>26 ± 25</td><td>a</td></tr><tr><td>0.227140 ± 0.000011</td><td>13.92 ± 0.02</td><td>49 ± 4</td><td>a</td><td>0.728725 ± 0.000162</td><td>13.59 ± 4.86</td><td>17 ± 265</td><td>c</td></tr><tr><td>0.254161 ± 0.000026</td><td>13.36 ± 0.06</td><td>56 ± 11</td><td>a</td><td>0.748230 ± 0.000218</td><td>13.66 ± 45.99</td><td>10 ± 655</td><td>c</td></tr><tr><td>0.258088 ± 0.000014</td><td>13.28 ± 0.04</td><td>31 ± 4</td><td>a</td><td>0.787243 ± 0.000076</td><td>14.08 ± 0.03</td><td>139 ± 11</td><td>a</td></tr><tr><td>0.261066 ± 0.000004</td><td>14.75 ± 0.01</td><td>61 ± 1</td><td>a</td><td>0.797692 ± 0.000142</td><td>13.65 ± 0.07</td><td>128 ± 47</td><td>a</td></tr><tr><td>0.294558 ± 0.000012</td><td>13.81 ± 0.03</td><td>38 ± 4</td><td>a</td><td>0.809425 ± 0.000068</td><td>15.21 ± 0.14</td><td>29 ± 8</td><td>a</td></tr><tr><td>0.314209 ± 0.000046</td><td>13.74 ± 0.09</td><td>56 ± 12</td><td>a</td><td>0.818355 ± 0.000227</td><td>13.68 ± 25.78</td><td>12 ± 510</td><td>c</td></tr><tr><td>0.314527 ± 0.000014</td><td>13.65 ± 0.10</td><td>24 ± 5</td><td>a</td><td>0.831854 ± 0.000045</td><td>14.26 ± 0.63</td><td>17 ± 7</td><td>c</td></tr><tr><td>0.321764 ± 0.000008</td><td>13.75 ± 1.83</td><td>6 ± 7</td><td>c</td><td>0.834584 ± 0.000126</td><td>13.85 ± 5.91</td><td>19 ± 184</td><td>c</td></tr><tr><td>0.333328 ± 0.000013</td><td>13.75 ± 0.04</td><td>33 ± 4</td><td>a</td><td>0.847756 ± 0.000226</td><td>13.57 ± 0.08</td><td>170 ± 47</td><td>a</td></tr><tr><td>0.383118 ± 0.000009</td><td>13.32 ± 0.08</td><td>12 ± 3</td><td>a</td><td>0.875968 ± 0.000135</td><td>15.29 ± 0.12</td><td>24 ± 15</td><td>a</td></tr><tr><td>0.399112 ± 0.000003</td><td>16.84 ± 0.02</td><td>20 ± 1</td><td>a</td><td>0.876734 ± 0.000271</td><td>14.62 ± 0.32</td><td>13 ± 15</td><td>a</td></tr><tr><td>0.399165 ± 0.000011</td><td>15.26 ± 0.12</td><td>51 ± 3</td><td>a</td><td>0.889895 ± 0.000106</td><td>13.96 ± 0.41</td><td>14 ± 7</td><td>a</td></tr><tr><td>0.412355 ± 0.000007</td><td>13.91 ± 0.03</td><td>26 ± 3</td><td>a</td><td>0.907240 ± 0.000025</td><td>14.61 ± 0.08</td><td>50 ± 3</td><td>a</td></tr><tr><td>0.427684 ± 0.000029</td><td>13.40 ± 0.07</td><td>38 ± 9</td><td>a</td><td>0.926248 ± 0.000122</td><td>13.99 ± 2.75</td><td>20 ± 90</td><td>c</td></tr><tr><td>0.434283 ± 0.000012</td><td>13.75 ± 0.03</td><td>35 ± 4</td><td>a</td><td>—</td><td>—</td><td>—</td><td>—</td></tr></tbody></table>

Notes. (1) and (5): H<sub>I</sub> redshift. (2) and (6): H<sub>I</sub> column density from Voigt profile fitting. (3) and (7): H<sub>I</sub> Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) 'secure'; (b) 'probable'; and (c) 'uncertain' (see Section 4.3 for definitions). See Section 4 for further details.
<table><caption>**Table A3.** H I absorption systems in QSO Q0107–0232.</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.198946 ± 0.000014</td><td>14.73 ± 0.11</td><td>52 ± 5</td><td>b</td><td>0.425130 ± 0.000014</td><td>13.93 ± 0.04</td><td>37 ± 5</td><td>a</td></tr><tr><td>0.203349 ± 0.000015</td><td>14.79 ± 0.15</td><td>42 ± 6</td><td>b</td><td>0.428308 ± 0.000005</td><td>16.01 ± 0.18</td><td>35 ± 2</td><td>a</td></tr><tr><td>0.227096 ± 0.000001</td><td>14.00 ± 0.01</td><td>50 ± 1</td><td>b</td><td>0.436369 ± 0.000014</td><td>13.76 ± 0.06</td><td>23 ± 10</td><td>a</td></tr><tr><td>0.244724 ± 0.000001</td><td>14.00 ± 0.01</td><td>50 ± 1</td><td>b</td><td>0.441843 ± 0.000056</td><td>14.26 ± 0.03</td><td>208 ± 17</td><td>a</td></tr><tr><td>0.261403 ± 0.000017</td><td>14.02 ± 0.05</td><td>43 ± 6</td><td>b</td><td>0.444586 ± 0.000040</td><td>13.70 ± 0.05</td><td>80 ± 13</td><td>a</td></tr><tr><td>0.266532 ± 0.000003</td><td>14.53 ± 0.07</td><td>49 ± 4</td><td>b</td><td>0.487116 ± 0.000219</td><td>14.08 ± 0.06</td><td>384 ± 76</td><td>a</td></tr><tr><td>0.268371 ± 0.000011</td><td>13.28 ± 0.14</td><td>9 ± 5</td><td>b</td><td>0.499733 ± 0.000136</td><td>14.03 ± 0.32</td><td>61 ± 95</td><td>a</td></tr><tr><td>0.268636 ± 0.000006</td><td>13.80 ± 0.07</td><td>16 ± 2</td><td>b</td><td>0.534585 ± 0.000006</td><td>16.11 ± 0.10</td><td>25 ± 2</td><td>a</td></tr><tr><td>0.281634 ± 0.000029</td><td>13.23 ± 0.11</td><td>40 ± 14</td><td>b</td><td>0.557390 ± 0.000003</td><td>19.49 ± 0.04</td><td>50 ± 1</td><td>a</td></tr><tr><td>0.294486 ± 0.000025</td><td>13.86 ± 0.08</td><td>28 ± 7</td><td>b</td><td>0.578538 ± 0.000022</td><td>14.83 ± 0.32</td><td>17 ± 8</td><td>a</td></tr><tr><td>0.308847 ± 0.000017</td><td>13.46 ± 0.05</td><td>34 ± 8</td><td>b</td><td>0.578750 ± 0.000096</td><td>15.02 ± 0.22</td><td>42 ± 13</td><td>a</td></tr><tr><td>0.331159 ± 0.000022</td><td>13.74 ± 0.06</td><td>40 ± 7</td><td>b</td><td>0.621996 ± 0.000017</td><td>14.49 ± 0.04</td><td>40 ± 4</td><td>a</td></tr><tr><td>0.350499 ± 0.000189</td><td>13.12 ± 0.45</td><td>43 ± 49</td><td>c</td><td>0.648707 ± 0.000005</td><td>15.53 ± 0.09</td><td>27 ± 2</td><td>a</td></tr><tr><td>0.355650 ± 0.000039</td><td>13.32 ± 0.08</td><td>47 ± 13</td><td>b</td><td>0.649744 ± 0.000322</td><td>13.81 ± 0.10</td><td>123 ± 33</td><td>a</td></tr><tr><td>0.357978 ± 0.000015</td><td>13.53 ± 0.05</td><td>27 ± 5</td><td>b</td><td>0.683657 ± 0.000082</td><td>14.22 ± 0.02</td><td>327 ± 25</td><td>a</td></tr><tr><td>0.365404 ± 0.000014</td><td>13.58 ± 0.05</td><td>30 ± 5</td><td>b</td><td>0.689792 ± 0.000024</td><td>14.87 ± 0.04</td><td>66 ± 3</td><td>a</td></tr><tr><td>0.375868 ± 0.000027</td><td>13.50 ± 0.07</td><td>41 ± 9</td><td>b</td><td>0.690043 ± 0.000018</td><td>14.30 ± 0.12</td><td>14 ± 6</td><td>a</td></tr><tr><td>0.380223 ± 0.000011</td><td>13.15 ± 0.07</td><td>13 ± 4</td><td>b</td><td>0.699929 ± 0.000380</td><td>13.21 ± 0.20</td><td>51 ± 1</td><td>a</td></tr><tr><td>0.380989 ± 0.000007</td><td>13.49 ± 0.09</td><td>11 ± 3</td><td>b</td><td>0.701110 ± 0.000190</td><td>13.43 ± 0.13</td><td>50 ± 1</td><td>a</td></tr><tr><td>0.381378 ± 0.000005</td><td>13.95 ± 0.30</td><td>11 ± 3</td><td>b</td><td>0.711212 ± 0.000026</td><td>14.06 ± 0.07</td><td>28 ± 4</td><td>a</td></tr><tr><td>0.401665 ± 0.000028</td><td>13.69 ± 0.76</td><td>8 ± 9</td><td>c</td><td>0.717351 ± 0.000008</td><td>14.89 ± 0.03</td><td>29 ± 1</td><td>a</td></tr><tr><td>0.416660 ± 0.001123</td><td>13.69 ± 0.98</td><td>152 ± 173</td><td>c</td><td>0.718062 ± 0.000029</td><td>14.37 ± 0.10</td><td>20 ± 5</td><td>a</td></tr><tr><td>0.417517 ± 0.000379</td><td>13.94 ± 0.54</td><td>131 ± 45</td><td>c</td><td>0.718310 ± 0.000009</td><td>15.06 ± 0.05</td><td>15 ± 2</td><td>a</td></tr><tr><td>0.423807 ± 0.000030</td><td>13.55 ± 0.06</td><td>46 ± 9</td><td>a</td><td>0.718741 ± 0.000011</td><td>14.64 ± 0.04</td><td>27 ± 2</td><td>a</td></tr><tr><td>0.424577 ± 0.000012</td><td>14.03 ± 0.04</td><td>36 ± 4</td><td>a</td><td>0.738861 ± 0.000089</td><td>13.39 ± 0.06</td><td>30 ± 1</td><td>b</td></tr></tbody></table>

Notes. (1) and (5): H I redshift. (2) and (6): H I column density from Voigt profile fitting. (3) and (7): H I Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) ‘secure’; (b) ‘probable’; and (c) ‘uncertain’ (see Section 4.3 for definitions). See Section 4 for further details.
<table><caption>Table A4. H1 absorption systems in QSO J020930.7-043826.</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.060451 ± 0.000004</td><td>16.08 ± 0.79</td><td>41 ± 8</td><td>c</td><td>0.252387 ± 0.000005</td><td>13.51 ± 0.04</td><td>14 ± 2</td><td>a</td></tr><tr><td>0.061037 ± 0.000006</td><td>13.96 ± 0.05</td><td>26 ± 3</td><td>b</td><td>0.258647 ± 0.000215</td><td>13.06 ± 0.88</td><td>29 ± 41</td><td>c</td></tr><tr><td>0.062140 ± 0.000008</td><td>13.45 ± 0.06</td><td>16 ± 4</td><td>b</td><td>0.258802 ± 0.000035</td><td>13.47 ± 0.34</td><td>18 ± 8</td><td>a</td></tr><tr><td>0.066439 ± 0.000014</td><td>13.96 ± 0.14</td><td>21 ± 8</td><td>b</td><td>0.260019 ± 0.000011</td><td>13.18 ± 0.07</td><td>13 ± 5</td><td>a</td></tr><tr><td>0.066676 ± 0.000016</td><td>14.07 ± 0.09</td><td>27 ± 6</td><td>b</td><td>0.270643 ± 0.000027</td><td>13.40 ± 0.05</td><td>58 ± 11</td><td>a</td></tr><tr><td>0.068032 ± 0.000026</td><td>13.39 ± 0.17</td><td>16 ± 9</td><td>b</td><td>0.271147 ± 0.000007</td><td>13.82 ± 0.02</td><td>32 ± 2</td><td>a</td></tr><tr><td>0.068200 ± 0.000043</td><td>13.32 ± 0.26</td><td>24 ± 18</td><td>b</td><td>0.278845 ± 0.000007</td><td>13.38 ± 0.04</td><td>17 ± 3</td><td>a</td></tr><tr><td>0.068780 ± 0.000018</td><td>14.88 ± 19.64</td><td>3 ± 15</td><td>c</td><td>0.285892 ± 0.000018</td><td>13.11 ± 0.07</td><td>25 ± 7</td><td>a</td></tr><tr><td>0.090942 ± 0.000021</td><td>12.80 ± 0.11</td><td>17 ± 10</td><td>b</td><td>0.292588 ± 0.000005</td><td>14.25 ± 0.02</td><td>44 ± 2</td><td>a</td></tr><tr><td>0.095413 ± 0.000008</td><td>14.05 ± 0.07</td><td>28 ± 4</td><td>b</td><td>0.294065 ± 0.000108</td><td>13.31 ± 0.51</td><td>23 ± 20</td><td>c</td></tr><tr><td>0.099244 ± 0.000011</td><td>13.66 ± 0.03</td><td>42 ± 5</td><td>b</td><td>0.294183 ± 0.000023</td><td>13.51 ± 0.29</td><td>10 ± 8</td><td>a</td></tr><tr><td>0.099635 ± 0.000032</td><td>12.72 ± 0.17</td><td>18 ± 15</td><td>b</td><td>0.297112 ± 0.000016</td><td>13.16 ± 0.06</td><td>22 ± 6</td><td>a</td></tr><tr><td>0.106732 ± 0.000009</td><td>13.45 ± 0.05</td><td>22 ± 4</td><td>b</td><td>0.297435 ± 0.000026</td><td>12.95 ± 0.12</td><td>21 ± 11</td><td>a</td></tr><tr><td>0.107026 ± 0.000030</td><td>13.19 ± 0.09</td><td>41 ± 13</td><td>b</td><td>0.297835 ± 0.000039</td><td>13.13 ± 0.10</td><td>43 ± 15</td><td>a</td></tr><tr><td>0.111795 ± 0.000185</td><td>17.95 ± 0.19</td><td>51 ± 17</td><td>b</td><td>0.298647 ± 0.000014</td><td>12.98 ± 0.11</td><td>9 ± 7</td><td>a</td></tr><tr><td>0.113543 ± 0.000022</td><td>13.04 ± 0.08</td><td>31 ± 10</td><td>b</td><td>0.299883 ± 0.000006</td><td>13.52 ± 0.20</td><td>9 ± 3</td><td>a</td></tr><tr><td>0.113866 ± 0.000017</td><td>12.85 ± 0.10</td><td>14 ± 8</td><td>b</td><td>0.300247 ± 0.000022</td><td>12.80 ± 0.12</td><td>12 ± 10</td><td>a</td></tr><tr><td>0.121290 ± 0.000006</td><td>13.90 ± 0.02</td><td>39 ± 2</td><td>b</td><td>0.300475 ± 0.000017</td><td>13.35 ± 30.78</td><td>2 ± 52</td><td>c</td></tr><tr><td>0.129062 ± 0.000006</td><td>13.54 ± 0.03</td><td>24 ± 2</td><td>b</td><td>0.300858 ± 0.000024</td><td>13.00 ± 0.11</td><td>19 ± 10</td><td>a</td></tr><tr><td>0.135900 ± 0.000064</td><td>13.65 ± 0.30</td><td>34 ± 12</td><td>b</td><td>0.301546 ± 0.000011</td><td>13.29 ± 0.43</td><td>7 ± 7</td><td>a</td></tr><tr><td>0.136159 ± 0.000025</td><td>14.36 ± 0.07</td><td>42 ± 5</td><td>b</td><td>0.305273 ± 0.000026</td><td>13.06 ± 0.17</td><td>10 ± 12</td><td>a</td></tr><tr><td>0.136700 ± 0.000018</td><td>13.24 ± 0.07</td><td>31 ± 8</td><td>b</td><td>0.305566 ± 0.000014</td><td>13.47 ± 0.21</td><td>10 ± 6</td><td>a</td></tr><tr><td>0.142066 ± 0.000005</td><td>14.30 ± 0.03</td><td>38 ± 2</td><td>b</td><td>0.309422 ± 0.000037</td><td>13.43 ± 0.07</td><td>53 ± 13</td><td>a</td></tr><tr><td>0.153342 ± 0.000018</td><td>13.31 ± 0.07</td><td>29 ± 7</td><td>b</td><td>0.315406 ± 0.000010</td><td>13.42 ± 0.09</td><td>13 ± 5</td><td>a</td></tr><tr><td>0.153903 ± 0.000008</td><td>13.61 ± 0.05</td><td>18 ± 3</td><td>b</td><td>0.316443 ± 0.000053</td><td>12.69 ± 0.24</td><td>18 ± 21</td><td>a</td></tr><tr><td>0.154236 ± 0.000010</td><td>13.61 ± 0.04</td><td>28 ± 4</td><td>b</td><td>0.332794 ± 0.000042</td><td>12.71 ± 0.26</td><td>10 ± 21</td><td>a</td></tr><tr><td>0.158239 ± 0.000055</td><td>13.44 ± 0.09</td><td>91 ± 28</td><td>b</td><td>0.333345 ± 0.000076</td><td>13.74 ± 0.32</td><td>27 ± 13</td><td>a</td></tr><tr><td>0.159197 ± 0.000017</td><td>13.60 ± 0.04</td><td>51 ± 6</td><td>b</td><td>0.333550 ± 0.000148</td><td>13.38 ± 0.83</td><td>26 ± 36</td><td>c</td></tr><tr><td>0.160967 ± 0.000005</td><td>14.17 ± 0.03</td><td>32 ± 2</td><td>b</td><td>0.333925 ± 0.000018</td><td>13.47 ± 0.18</td><td>10 ± 7</td><td>a</td></tr><tr><td>0.161315 ± 0.000046</td><td>13.05 ± 0.32</td><td>30 ± 21</td><td>b</td><td>0.334128 ± 0.000315</td><td>12.76 ± 2.57</td><td>35 ± 157</td><td>c</td></tr><tr><td>0.161665 ± 0.000020</td><td>13.96 ± 0.04</td><td>60 ± 6</td><td>b</td><td>0.334266 ± 0.000995</td><td>13.34 ± 0.91</td><td>149 ± 301</td><td>c</td></tr><tr><td>0.166490 ± 0.000040</td><td>13.38 ± 0.05</td><td>109 ± 15</td><td>b</td><td>0.334498 ± 0.000085</td><td>12.45 ± 1.19</td><td>10 ± 55</td><td>c</td></tr><tr><td>0.176407 ± 0.000013</td><td>12.97 ± 0.13</td><td>10 ± 8</td><td>b</td><td>0.334885 ± 0.000079</td><td>12.50 ± 0.82</td><td>10 ± 45</td><td>c</td></tr><tr><td>0.176854 ± 0.000114</td><td>13.49 ± 0.14</td><td>121 ± 43</td><td>b</td><td>0.335214 ± 0.000035</td><td>12.87 ± 0.33</td><td>10 ± 21</td><td>a</td></tr><tr><td>0.177641 ± 0.000124</td><td>13.16 ± 0.25</td><td>81 ± 37</td><td>b</td><td>0.335719 ± 0.000064</td><td>12.51 ± 0.38</td><td>8 ± 35</td><td>a</td></tr><tr><td>0.181080 ± 0.000036</td><td>12.87 ± 0.13</td><td>30 ± 15</td><td>b</td><td>0.336231 ± 0.000034</td><td>12.81 ± 0.23</td><td>8 ± 18</td><td>a</td></tr><tr><td>0.181325 ± 0.000016</td><td>12.98 ± 0.12</td><td>10 ± 8</td><td>b</td><td>0.336972 ± 0.000048</td><td>12.65 ± 0.28</td><td>8 ± 25</td><td>a</td></tr><tr><td>0.181485 ± 0.000044</td><td>12.65 ± 0.26</td><td>17 ± 20</td><td>b</td><td>0.337387 ± 0.000102</td><td>12.12 ± 0.67</td><td>8 ± 58</td><td>c</td></tr><tr><td>0.182500 ± 0.000006</td><td>13.93 ± 0.03</td><td>26 ± 2</td><td>b</td><td>0.338262 ± 0.000021</td><td>14.06 ± 0.02</td><td>98 ± 7</td><td>a</td></tr><tr><td>0.182847 ± 0.000019</td><td>13.79 ± 0.04</td><td>56 ± 6</td><td>b</td><td>0.340036 ± 0.000014</td><td>14.00 ± 0.13</td><td>11 ± 3</td><td>a</td></tr><tr><td>0.184403 ± 0.000003</td><td>14.04 ± 0.05</td><td>21 ± 2</td><td>b</td><td>0.340189 ± 0.000010</td><td>16.14 ± 2.98</td><td>4 ± 3</td><td>c</td></tr><tr><td>0.188538 ± 0.000014</td><td>13.21 ± 0.05</td><td>29 ± 6</td><td>b</td><td>0.340357 ± 0.000007</td><td>15.72 ± 4.71</td><td>5 ± 6</td><td>c</td></tr><tr><td>0.198091 ± 0.000016</td><td>13.21 ± 0.06</td><td>26 ± 6</td><td>b</td><td>0.346358 ± 0.000017</td><td>13.10 ± 0.08</td><td>19 ± 7</td><td>a</td></tr><tr><td>0.201414 ± 0.000014</td><td>13.06 ± 0.06</td><td>23 ± 6</td><td>b</td><td>0.347682 ± 0.000015</td><td>13.41 ± 0.04</td><td>32 ± 5</td><td>a</td></tr><tr><td>0.202332 ± 0.000021</td><td>12.94 ± 0.08</td><td>26 ± 9</td><td>b</td><td>0.368325 ± 0.000040</td><td>14.28 ± 0.15</td><td>32 ± 8</td><td>a</td></tr><tr><td>0.205297 ± 0.000009</td><td>13.31 ± 0.03</td><td>28 ± 3</td><td>b</td><td>0.372673 ± 0.000038</td><td>13.08 ± 0.10</td><td>39 ± 13</td><td>a</td></tr><tr><td>0.207624 ± 0.000012</td><td>13.15 ± 0.04</td><td>27 ± 5</td><td>b</td><td>0.377730 ± 0.000011</td><td>13.37 ± 0.05</td><td>19 ± 4</td><td>a</td></tr><tr><td>0.208589 ± 0.000009</td><td>13.43 ± 0.03</td><td>36 ± 3</td><td>b</td><td>0.378344 ± 0.000024</td><td>13.32 ± 0.06</td><td>39 ± 8</td><td>a</td></tr><tr><td>0.210791 ± 0.000010</td><td>12.95 ± 0.07</td><td>10 ± 5</td><td>b</td><td>0.384764 ± 0.000016</td><td>13.44 ± 0.05</td><td>32 ± 5</td><td>a</td></tr><tr><td>0.213760 ± 0.000019</td><td>12.91 ± 0.09</td><td>18 ± 8</td><td>b</td><td>0.389465 ± 0.000251</td><td>13.80 ± 0.66</td><td>46 ± 33</td><td>c</td></tr><tr><td>0.216171 ± 0.000012</td><td>14.23 ± 0.09</td><td>26 ± 4</td><td>b</td><td>0.389812 ± 0.000048</td><td>15.61 ± 0.16</td><td>34 ± 7</td><td>a</td></tr><tr><td>0.216436 ± 0.000101</td><td>13.26 ± 0.31</td><td>39 ± 26</td><td>b</td><td>0.390027 ± 0.000100</td><td>15.40 ± 0.80</td><td>20 ± 28</td><td>c</td></tr><tr><td>0.226416 ± 0.000012</td><td>13.08 ± 0.06</td><td>15 ± 5</td><td>b</td><td>0.390491 ± 0.000012</td><td>18.87 ± 0.03</td><td>34 ± 1</td><td>a</td></tr><tr><td>0.226677 ± 0.000021</td><td>12.88 ± 0.10</td><td>20 ± 9</td><td>b</td><td>0.395011 ± 0.000045</td><td>12.56 ± 0.32</td><td>10 ± 20</td><td>a</td></tr><tr><td>0.227182 ± 0.000015</td><td>13.08 ± 0.06</td><td>23 ± 6</td><td>b</td><td>0.395298 ± 0.000012</td><td>13.73 ± 0.03</td><td>32 ± 4</td><td>a</td></tr><tr><td>0.227719 ± 0.000018</td><td>13.11 ± 0.06</td><td>30 ± 7</td><td>b</td><td>0.416444 ± 0.000014</td><td>13.93 ± 0.03</td><td>48 ± 4</td><td>a</td></tr><tr><td>0.230020 ± 0.000028</td><td>12.85 ± 0.12</td><td>21 ± 12</td><td>b</td><td>0.427766 ± 0.000056</td><td>12.85 ± 0.22</td><td>24 ± 19</td><td>a</td></tr><tr><td>0.230462 ± 0.000235</td><td>13.12 ± 1.01</td><td>28 ± 45</td><td>c</td><td>0.433143 ± 0.000017</td><td>13.25 ± 0.10</td><td>14 ± 6</td><td>a</td></tr><tr><td>0.230584 ± 0.000026</td><td>13.36 ± 0.54</td><td>13 ± 12</td><td>c</td><td>0.437928 ± 0.000020</td><td>13.55 ± 0.08</td><td>19 ± 6</td><td>a</td></tr><tr><td>0.230912 ± 0.000014</td><td>13.34 ± 0.05</td><td>28 ± 5</td><td>b</td><td>0.438152 ± 0.000027</td><td>13.38 ± 0.12</td><td>19 ± 8</td><td>a</td></tr><tr><td>0.231860 ± 0.000013</td><td>13.04 ± 0.08</td><td>12 ± 6</td><td>b</td><td>0.453440 ± 0.000041</td><td>13.00 ± 0.18</td><td>19 ± 13</td><td>a</td></tr><tr><td>0.235690 ± 0.000011</td><td>13.61 ± 0.03</td><td>49 ± 4</td><td>b</td><td>0.453773 ± 0.000053</td><td>13.12 ± 0.16</td><td>32 ± 18</td><td>a</td></tr><tr><td>0.238824 ± 0.000005</td><td>14.04 ± 0.01</td><td>44 ± 2</td><td>b</td><td>0.455573 ± 0.000029</td><td>13.09 ± 0.12</td><td>19 ± 10</td><td>a</td></tr></tbody></table>
<table><caption>Table A4 – continued</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.458689 ± 0.000016</td><td>13.14 ± 0.10</td><td>11 ± 6</td><td>a</td><td>0.851542 ± 0.000125</td><td>14.00 ± 0.06</td><td>131 ± 34</td><td>a</td></tr><tr><td>0.459402 ± 0.000023</td><td>13.42 ± 22.65</td><td>3 ± 44</td><td>c</td><td>0.863731 ± 0.000046</td><td>14.34 ± 0.09</td><td>69 ± 14</td><td>a</td></tr><tr><td>0.459695 ± 0.000013</td><td>13.49 ± 0.64</td><td>7 ± 7</td><td>c</td><td>0.910650 ± 0.000128</td><td>13.60 ± 0.09</td><td>58 ± 42</td><td>a</td></tr><tr><td>0.522512 ± 0.000026</td><td>13.78 ± 0.11</td><td>19 ± 9</td><td>a</td><td>0.931808 ± 0.000043</td><td>14.42 ± 1.38</td><td>31 ± 33</td><td>c</td></tr><tr><td>0.522971 ± 0.000010</td><td>14.67 ± 0.02</td><td>46 ± 3</td><td>a</td><td>0.979095 ± 0.000069</td><td>13.83 ± 0.08</td><td>49 ± 23</td><td>a</td></tr><tr><td>0.534301 ± 0.000012</td><td>13.88 ± 0.09</td><td>9 ± 5</td><td>a</td><td>0.981854 ± 0.000057</td><td>13.95 ± 0.20</td><td>37 ± 23</td><td>a</td></tr><tr><td>0.569362 ± 0.000013</td><td>14.36 ± 0.05</td><td>18 ± 4</td><td>a</td><td>0.997422 ± 0.000034</td><td>15.63 ± 0.08</td><td>61 ± 3</td><td>a</td></tr><tr><td>0.587029 ± 0.000018</td><td>14.49 ± 0.04</td><td>38 ± 5</td><td>a</td><td>1.031725 ± 0.000127</td><td>13.88 ± 0.04</td><td>185 ± 29</td><td>a</td></tr><tr><td>0.612204 ± 0.000092</td><td>13.85 ± 0.06</td><td>89 ± 31</td><td>a</td><td>1.047300 ± 0.000030</td><td>15.25 ± 0.08</td><td>90 ± 5</td><td>a</td></tr><tr><td>0.711992 ± 0.000157</td><td>13.97 ± 0.07</td><td>131 ± 46</td><td>a</td><td>1.058936 ± 0.000041</td><td>14.55 ± 0.20</td><td>57 ± 13</td><td>a</td></tr><tr><td>0.737687 ± 0.000088</td><td>14.25 ± 0.07</td><td>103 ± 17</td><td>a</td><td>1.071464 ± 0.000074</td><td>13.89 ± 0.04</td><td>106 ± 18</td><td>a</td></tr><tr><td>0.747342 ± 0.000086</td><td>14.26 ± 0.05</td><td>123 ± 25</td><td>a</td><td>1.088313 ± 0.000093</td><td>13.95 ± 0.04</td><td>147 ± 21</td><td>a</td></tr><tr><td>0.773239 ± 0.000302</td><td>13.65 ± 1.73</td><td>22 ± 153</td><td>c</td><td>1.101964 ± 0.000163</td><td>13.86 ± 0.49</td><td>31 ± 112</td><td>c</td></tr><tr><td>0.826922 ± 0.000011</td><td>15.13 ± 0.04</td><td>22 ± 2</td><td>a</td><td>1.103122 ± 0.000813</td><td>13.98 ± 0.38</td><td>152 ± 137</td><td>a</td></tr><tr><td>0.827853 ± 0.000029</td><td>14.85 ± 0.05</td><td>40 ± 3</td><td>a</td><td>1.130106 ± 0.000037</td><td>15.70 ± 0.28</td><td>91 ± 9</td><td>b</td></tr></tbody></table>

Notes. (1) and (5): H I redshift. (2) and (6): H I column density from Voigt profile fitting. (3) and (7): H I Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) ‘secure’; (b) ‘probable’; and (c) ‘uncertain’ (see Section 4.3 for definitions). See Section 4 for further details.
<table><caption>Table A5. H<sub>I</sub> absorption systems in QSO J100535.24+013445.7.</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.004126 ± 0.001790</td><td>13.87 ± 6.19</td><td>63 ± 209</td><td>c</td><td>0.208169 ± 0.000013</td><td>13.39 ± 0.07</td><td>17 ± 6</td><td>a</td></tr><tr><td>0.004283 ± 0.000106</td><td>14.55 ± 1.30</td><td>46 ± 30</td><td>c</td><td>0.208379 ± 0.000041</td><td>12.87 ± 0.20</td><td>19 ± 18</td><td>a</td></tr><tr><td>0.005998 ± 0.000037</td><td>13.01 ± 0.14</td><td>31 ± 17</td><td>b</td><td>0.220071 ± 0.000209</td><td>12.68 ± 0.90</td><td>26 ± 54</td><td>c</td></tr><tr><td>0.017673 ± 0.000020</td><td>13.21 ± 0.09</td><td>25 ± 10</td><td>b</td><td>0.220228 ± 0.000030</td><td>13.16 ± 0.28</td><td>15 ± 10</td><td>a</td></tr><tr><td>0.018720 ± 0.000008</td><td>13.53 ± 0.45</td><td>8 ± 6</td><td>b</td><td>0.221860 ± 0.000013</td><td>13.89 ± 0.03</td><td>48 ± 5</td><td>a</td></tr><tr><td>0.020953 ± 0.000021</td><td>13.23 ± 0.08</td><td>29 ± 10</td><td>b</td><td>0.227388 ± 0.000039</td><td>12.76 ± 0.21</td><td>14 ± 18</td><td>a</td></tr><tr><td>0.023897 ± 0.000052</td><td>13.19 ± 0.24</td><td>28 ± 22</td><td>b</td><td>0.228437 ± 0.000008</td><td>14.17 ± 0.06</td><td>30 ± 3</td><td>a</td></tr><tr><td>0.024157 ± 0.000012</td><td>14.30 ± 0.15</td><td>27 ± 9</td><td>b</td><td>0.228755 ± 0.000038</td><td>12.89 ± 0.23</td><td>15 ± 19</td><td>a</td></tr><tr><td>0.024347 ± 0.000026</td><td>13.23 ± 0.29</td><td>8 ± 14</td><td>b</td><td>0.229045 ± 0.000050</td><td>13.00 ± 0.17</td><td>30 ± 21</td><td>a</td></tr><tr><td>0.025422 ± 0.000017</td><td>13.10 ± 0.09</td><td>19 ± 9</td><td>b</td><td>0.234558 ± 0.000048</td><td>12.82 ± 0.27</td><td>15 ± 25</td><td>a</td></tr><tr><td>0.030210 ± 0.000011</td><td>13.17 ± 0.22</td><td>8 ± 9</td><td>b</td><td>0.234733 ± 0.000046</td><td>12.70 ± 0.28</td><td>8 ± 29</td><td>a</td></tr><tr><td>0.030732 ± 0.000015</td><td>13.75 ± 0.05</td><td>35 ± 6</td><td>b</td><td>0.247570 ± 0.000010</td><td>13.69 ± 0.03</td><td>36 ± 4</td><td>a</td></tr><tr><td>0.031179 ± 0.000059</td><td>13.09 ± 0.23</td><td>32 ± 31</td><td>b</td><td>0.253598 ± 0.000068</td><td>12.58 ± 0.50</td><td>10 ± 31</td><td>c</td></tr><tr><td>0.032172 ± 0.000013</td><td>13.77 ± 0.07</td><td>18 ± 5</td><td>b</td><td>0.253745 ± 0.000023</td><td>13.22 ± 0.12</td><td>13 ± 9</td><td>a</td></tr><tr><td>0.032359 ± 0.000010</td><td>14.22 ± 0.21</td><td>20 ± 5</td><td>b</td><td>0.259976 ± 0.000042</td><td>12.40 ± 0.26</td><td>9 ± 24</td><td>a</td></tr><tr><td>0.036397 ± 0.000032</td><td>13.43 ± 0.12</td><td>35 ± 14</td><td>b</td><td>0.260340 ± 0.000039</td><td>13.19 ± 0.26</td><td>25 ± 11</td><td>a</td></tr><tr><td>0.041237 ± 0.000010</td><td>13.88 ± 0.03</td><td>48 ± 4</td><td>b</td><td>0.260614 ± 0.000135</td><td>13.04 ± 0.42</td><td>45 ± 48</td><td>a</td></tr><tr><td>0.042913 ± 0.000032</td><td>13.42 ± 0.07</td><td>60 ± 14</td><td>b</td><td>0.260957 ± 0.000018</td><td>12.86 ± 0.14</td><td>8 ± 11</td><td>a</td></tr><tr><td>0.044827 ± 0.000012</td><td>13.70 ± 0.04</td><td>38 ± 5</td><td>b</td><td>0.261251 ± 0.000012</td><td>13.05 ± 0.14</td><td>8 ± 7</td><td>a</td></tr><tr><td>0.045967 ± 0.000029</td><td>13.53 ± 0.06</td><td>63 ± 12</td><td>b</td><td>0.263451 ± 0.000075</td><td>13.02 ± 0.87</td><td>8 ± 20</td><td>c</td></tr><tr><td>0.050678 ± 0.000012</td><td>13.37 ± 0.37</td><td>8 ± 8</td><td>b</td><td>0.263579 ± 0.000052</td><td>13.68 ± 0.66</td><td>16 ± 28</td><td>c</td></tr><tr><td>0.055899 ± 0.000037</td><td>13.02 ± 0.20</td><td>19 ± 19</td><td>b</td><td>0.263792 ± 0.000275</td><td>14.35 ± 3.83</td><td>25 ± 46</td><td>c</td></tr><tr><td>0.056062 ± 0.000022</td><td>13.10 ± 0.17</td><td>10 ± 14</td><td>b</td><td>0.263890 ± 0.003764</td><td>13.52 ± 25.71</td><td>30 ± 283</td><td>c</td></tr><tr><td>0.062474 ± 0.000023</td><td>13.39 ± 0.11</td><td>26 ± 9</td><td>b</td><td>0.269670 ± 0.000047</td><td>12.86 ± 0.27</td><td>8 ± 20</td><td>a</td></tr><tr><td>0.062733 ± 0.000019</td><td>13.65 ± 0.06</td><td>35 ± 8</td><td>b</td><td>0.269789 ± 0.000071</td><td>12.58 ± 0.65</td><td>8 ± 48</td><td>c</td></tr><tr><td>0.083817 ± 0.000023</td><td>13.04 ± 0.12</td><td>17 ± 11</td><td>b</td><td>0.269941 ± 0.000013</td><td>13.30 ± 0.11</td><td>9 ± 6</td><td>a</td></tr><tr><td>0.091821 ± 0.000018</td><td>12.76 ± 0.13</td><td>9 ± 11</td><td>b</td><td>0.277080 ± 0.000009</td><td>13.66 ± 0.03</td><td>36 ± 3</td><td>a</td></tr><tr><td>0.093141 ± 0.000015</td><td>12.84 ± 0.12</td><td>9 ± 9</td><td>b</td><td>0.278937 ± 0.000019</td><td>12.99 ± 0.09</td><td>18 ± 8</td><td>a</td></tr><tr><td>0.093358 ± 0.000017</td><td>12.86 ± 0.11</td><td>13 ± 9</td><td>b</td><td>0.283533 ± 0.000013</td><td>13.03 ± 0.08</td><td>11 ± 6</td><td>a</td></tr><tr><td>0.099344 ± 0.004656</td><td>13.91 ± 62.47</td><td>17 ± 787</td><td>c</td><td>0.298063 ± 0.000012</td><td>13.10 ± 0.09</td><td>10 ± 6</td><td>a</td></tr><tr><td>0.099825 ± 0.001999</td><td>15.98 ± 80.21</td><td>69 ± 1018</td><td>c</td><td>0.298335 ± 0.000013</td><td>13.47 ± 0.04</td><td>30 ± 5</td><td>a</td></tr><tr><td>0.100238 ± 0.047492</td><td>14.80 ± 412.41</td><td>27 ± 3682</td><td>c</td><td>0.304531 ± 0.000013</td><td>13.43 ± 0.09</td><td>13 ± 5</td><td>a</td></tr><tr><td>0.103008 ± 0.000123</td><td>13.25 ± 0.37</td><td>40 ± 50</td><td>b</td><td>0.304809 ± 0.000041</td><td>13.02 ± 0.16</td><td>25 ± 17</td><td>a</td></tr><tr><td>0.109920 ± 0.000022</td><td>13.39 ± 0.05</td><td>54 ± 9</td><td>a</td><td>0.305769 ± 0.000023</td><td>13.02 ± 0.21</td><td>8 ± 13</td><td>a</td></tr><tr><td>0.115162 ± 0.000008</td><td>13.20 ± 0.08</td><td>10 ± 5</td><td>a</td><td>0.307151 ± 0.000029</td><td>13.11 ± 0.14</td><td>19 ± 14</td><td>a</td></tr><tr><td>0.115374 ± 0.000007</td><td>13.48 ± 0.04</td><td>21 ± 3</td><td>a</td><td>0.307398 ± 0.000023</td><td>13.10 ± 0.12</td><td>14 ± 10</td><td>a</td></tr><tr><td>0.140988 ± 0.000009</td><td>13.09 ± 0.11</td><td>8 ± 5</td><td>a</td><td>0.311504 ± 0.000012</td><td>13.90 ± 0.03</td><td>38 ± 5</td><td>a</td></tr><tr><td>0.142199 ± 0.000012</td><td>13.07 ± 0.07</td><td>15 ± 5</td><td>a</td><td>0.334265 ± 0.000028</td><td>13.24 ± 0.12</td><td>19 ± 10</td><td>a</td></tr><tr><td>0.145845 ± 0.000011</td><td>13.42 ± 0.04</td><td>35 ± 4</td><td>a</td><td>0.334529 ± 0.000025</td><td>13.21 ± 0.38</td><td>8 ± 16</td><td>a</td></tr><tr><td>0.149751 ± 0.000014</td><td>13.02 ± 0.16</td><td>8 ± 9</td><td>a</td><td>0.352647 ± 0.000024</td><td>13.11 ± 0.08</td><td>28 ± 9</td><td>a</td></tr><tr><td>0.153657 ± 0.000020</td><td>12.93 ± 0.12</td><td>14 ± 9</td><td>a</td><td>0.354692 ± 0.000022</td><td>13.37 ± 0.05</td><td>42 ± 7</td><td>a</td></tr><tr><td>0.155088 ± 0.000022</td><td>13.03 ± 0.09</td><td>24 ± 9</td><td>a</td><td>0.362482 ± 0.000013</td><td>13.22 ± 0.10</td><td>11 ± 6</td><td>a</td></tr><tr><td>0.155443 ± 0.000009</td><td>13.30 ± 0.06</td><td>15 ± 4</td><td>a</td><td>0.363048 ± 0.000014</td><td>13.14 ± 0.18</td><td>8 ± 7</td><td>a</td></tr><tr><td>0.155690 ± 0.000010</td><td>13.35 ± 0.05</td><td>20 ± 5</td><td>a</td><td>0.363363 ± 0.000034</td><td>12.70 ± 0.22</td><td>8 ± 18</td><td>a</td></tr><tr><td>0.156048 ± 0.000023</td><td>13.10 ± 0.09</td><td>29 ± 10</td><td>a</td><td>0.363567 ± 0.000018</td><td>13.18 ± 0.09</td><td>15 ± 8</td><td>a</td></tr><tr><td>0.163214 ± 0.000024</td><td>13.18 ± 0.09</td><td>29 ± 10</td><td>a</td><td>0.363815 ± 0.000025</td><td>12.83 ± 0.17</td><td>8 ± 13</td><td>a</td></tr><tr><td>0.165827 ± 0.000017</td><td>13.13 ± 0.06</td><td>32 ± 7</td><td>a</td><td>0.371441 ± 0.000009</td><td>14.09 ± 0.02</td><td>43 ± 3</td><td>a</td></tr><tr><td>0.178489 ± 0.000029</td><td>13.60 ± 0.04</td><td>102 ± 11</td><td>a</td><td>0.371920 ± 0.000024</td><td>12.84 ± 0.16</td><td>8 ± 12</td><td>a</td></tr><tr><td>0.185207 ± 0.000019</td><td>12.87 ± 0.11</td><td>15 ± 8</td><td>a</td><td>0.373098 ± 0.000028</td><td>13.69 ± 0.07</td><td>47 ± 10</td><td>a</td></tr><tr><td>0.185388 ± 0.000015</td><td>12.96 ± 0.10</td><td>14 ± 8</td><td>a</td><td>0.373607 ± 0.000101</td><td>13.09 ± 0.24</td><td>47 ± 34</td><td>a</td></tr><tr><td>0.185639 ± 0.000013</td><td>13.35 ± 0.06</td><td>24 ± 6</td><td>a</td><td>0.377147 ± 0.000022</td><td>12.93 ± 0.09</td><td>19 ± 8</td><td>a</td></tr><tr><td>0.185822 ± 0.000021</td><td>12.77 ± 0.20</td><td>10 ± 12</td><td>a</td><td>0.392467 ± 0.000016</td><td>12.99 ± 0.08</td><td>15 ± 6</td><td>a</td></tr><tr><td>0.185980 ± 0.000023</td><td>12.60 ± 0.16</td><td>10 ± 13</td><td>a</td><td>0.409919 ± 0.000034</td><td>13.00 ± 0.15</td><td>22 ± 15</td><td>a</td></tr><tr><td>0.186191 ± 0.000021</td><td>12.56 ± 0.15</td><td>10 ± 11</td><td>a</td><td>0.413831 ± 0.000010</td><td>13.90 ± 0.03</td><td>41 ± 3</td><td>a</td></tr><tr><td>0.186444 ± 0.000021</td><td>12.55 ± 0.15</td><td>10 ± 11</td><td>a</td><td>0.417584 ± 0.000014</td><td>14.58 ± 0.06</td><td>25 ± 4</td><td>a</td></tr><tr><td>0.187977 ± 0.000011</td><td>13.21 ± 0.04</td><td>26 ± 4</td><td>a</td><td>0.418078 ± 0.000089</td><td>14.43 ± 0.23</td><td>36 ± 18</td><td>a</td></tr><tr><td>0.193331 ± 0.000031</td><td>12.99 ± 0.09</td><td>36 ± 12</td><td>a</td><td>0.418369 ± 0.000048</td><td>15.62 ± 0.23</td><td>19 ± 8</td><td>a</td></tr><tr><td>0.199238 ± 0.000023</td><td>13.30 ± 0.05</td><td>58 ± 8</td><td>a</td><td>0.418573 ± 0.000010</td><td>16.84 ± 0.05</td><td>17 ± 1</td><td>a</td></tr><tr><td>0.200115 ± 0.000023</td><td>12.74 ± 0.12</td><td>8 ± 14</td><td>a</td><td>0.419694 ± 0.000005</td><td>15.67 ± 0.05</td><td>23 ± 1</td><td>a</td></tr><tr><td>0.200252 ± 0.000031</td><td>12.59 ± 0.18</td><td>8 ± 20</td><td>a</td><td>0.426592 ± 0.000014</td><td>13.15 ± 0.07</td><td>14 ± 6</td><td>a</td></tr><tr><td>0.204079 ± 0.000016</td><td>12.92 ± 0.07</td><td>20 ± 7</td><td>a</td><td>0.426800 ± 0.000059</td><td>12.79 ± 0.45</td><td>8 ± 23</td><td>c</td></tr></tbody></table>
<table><caption>**Table A5 – continued**</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.426932 ± 0.000039</td><td>13.03 ± 0.26</td><td>10 ± 18</td><td>a</td><td>0.725336 ± 0.000022</td><td>14.41 ± 0.05</td><td>37 ± 6</td><td>a</td></tr><tr><td>0.433141 ± 0.000009</td><td>13.53 ± 0.04</td><td>22 ± 3</td><td>a</td><td>0.763229 ± 0.001900</td><td>14.09 ± 8.49</td><td>27 ± 122</td><td>c</td></tr><tr><td>0.433472 ± 0.000018</td><td>13.13 ± 0.08</td><td>19 ± 7</td><td>a</td><td>0.763320 ± 0.000053</td><td>14.59 ± 2.61</td><td>16 ± 33</td><td>c</td></tr><tr><td>0.433969 ± 0.000012</td><td>13.78 ± 0.03</td><td>41 ± 4</td><td>a</td><td>0.763621 ± 0.000043</td><td>14.13 ± 0.25</td><td>11 ± 11</td><td>b</td></tr><tr><td>0.441951 ± 0.000014</td><td>13.66 ± 0.03</td><td>39 ± 4</td><td>a</td><td>0.830741 ± 0.000017</td><td>14.97 ± 0.04</td><td>32 ± 4</td><td>b</td></tr><tr><td>0.451881 ± 0.000017</td><td>12.97 ± 0.08</td><td>15 ± 6</td><td>a</td><td>0.836979 ± 0.000012</td><td>16.39 ± 0.03</td><td>28 ± 2</td><td>b</td></tr><tr><td>0.472785 ± 0.000020</td><td>13.14 ± 0.12</td><td>11 ± 8</td><td>a</td><td>0.837395 ± 0.000012</td><td>16.29 ± 0.03</td><td>24 ± 2</td><td>b</td></tr><tr><td>0.473199 ± 0.000014</td><td>13.65 ± 0.05</td><td>23 ± 4</td><td>a</td><td>0.839423 ± 0.000009</td><td>16.11 ± 0.03</td><td>34 ± 2</td><td>b</td></tr><tr><td>0.478227 ± 0.000038</td><td>14.14 ± 0.05</td><td>83 ± 13</td><td>a</td><td>–</td><td>–</td><td>–</td><td>–</td></tr></tbody></table>

Notes. (1) and (5): H1 redshift. (2) and (6): H1 column density from Voigt profile fitting. (3) and (7): H1 Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) ‘secure’; (b) ‘probable’; and (c) ‘uncertain’ (see Section 4.3 for definitions). See Section 4 for further details.

<table><caption>**Table A6. H1 absorption systems in QSO J102218.99+013218.8.**</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.050692 ± 0.000028</td><td>13.54 ± 0.08</td><td>46 ± 12</td><td>b</td><td>0.279424 ± 0.000045</td><td>13.99 ± 0.80</td><td>23 ± 17</td><td>c</td></tr><tr><td>0.056892 ± 0.000017</td><td>17.24 ± 0.49</td><td>13 ± 2</td><td>b</td><td>0.279616 ± 0.000930</td><td>13.43 ± 3.51</td><td>43 ± 278</td><td>c</td></tr><tr><td>0.057127 ± 0.000205</td><td>13.49 ± 0.61</td><td>50 ± 55</td><td>c</td><td>0.279935 ± 0.000149</td><td>13.13 ± 1.03</td><td>25 ± 32</td><td>c</td></tr><tr><td>0.058275 ± 0.000052</td><td>13.43 ± 0.14</td><td>49 ± 24</td><td>b</td><td>0.290005 ± 0.000018</td><td>13.48 ± 0.07</td><td>24 ± 6</td><td>a</td></tr><tr><td>0.058626 ± 0.000014</td><td>13.82 ± 0.11</td><td>20 ± 6</td><td>b</td><td>0.293121 ± 0.000016</td><td>13.68 ± 0.05</td><td>32 ± 6</td><td>a</td></tr><tr><td>0.072400 ± 0.000009</td><td>14.09 ± 0.06</td><td>33 ± 4</td><td>b</td><td>0.293685 ± 0.000038</td><td>13.45 ± 0.15</td><td>24 ± 13</td><td>a</td></tr><tr><td>0.074368 ± 0.000022</td><td>14.21 ± 0.07</td><td>34 ± 7</td><td>b</td><td>0.293969 ± 0.000044</td><td>13.43 ± 0.15</td><td>29 ± 14</td><td>a</td></tr><tr><td>0.074596 ± 0.000035</td><td>13.48 ± 0.24</td><td>18 ± 12</td><td>b</td><td>0.303449 ± 0.000016</td><td>13.73 ± 0.06</td><td>25 ± 6</td><td>a</td></tr><tr><td>0.093134 ± 0.000018</td><td>13.18 ± 0.10</td><td>19 ± 9</td><td>b</td><td>0.303737 ± 0.000020</td><td>13.42 ± 0.10</td><td>16 ± 8</td><td>a</td></tr><tr><td>0.116075 ± 0.000017</td><td>13.19 ± 0.10</td><td>16 ± 9</td><td>a</td><td>0.306712 ± 0.000025</td><td>14.14 ± 0.10</td><td>23 ± 9</td><td>a</td></tr><tr><td>0.119165 ± 0.000014</td><td>13.61 ± 0.10</td><td>18 ± 6</td><td>a</td><td>0.340110 ± 0.000018</td><td>13.28 ± 0.18</td><td>10 ± 8</td><td>a</td></tr><tr><td>0.124133 ± 0.000009</td><td>13.81 ± 0.05</td><td>25 ± 4</td><td>a</td><td>0.340550 ± 0.000056</td><td>13.24 ± 0.13</td><td>44 ± 20</td><td>a</td></tr><tr><td>0.127075 ± 0.000020</td><td>13.34 ± 0.10</td><td>22 ± 8</td><td>a</td><td>0.341307 ± 0.000050</td><td>13.47 ± 0.12</td><td>45 ± 17</td><td>a</td></tr><tr><td>0.133211 ± 0.000011</td><td>13.37 ± 0.09</td><td>14 ± 5</td><td>a</td><td>0.341763 ± 0.000041</td><td>13.48 ± 0.11</td><td>38 ± 14</td><td>a</td></tr><tr><td>0.134934 ± 0.000030</td><td>13.26 ± 0.12</td><td>27 ± 13</td><td>a</td><td>0.346040 ± 0.000031</td><td>13.29 ± 0.11</td><td>26 ± 11</td><td>a</td></tr><tr><td>0.137339 ± 0.000005</td><td>14.29 ± 0.09</td><td>20 ± 2</td><td>a</td><td>0.346439 ± 0.000022</td><td>13.16 ± 0.14</td><td>11 ± 9</td><td>a</td></tr><tr><td>0.149280 ± 0.000033</td><td>13.41 ± 0.09</td><td>46 ± 13</td><td>a</td><td>0.360867 ± 0.000033</td><td>13.34 ± 0.10</td><td>31 ± 12</td><td>a</td></tr><tr><td>0.160057 ± 0.000016</td><td>13.02 ± 0.10</td><td>14 ± 8</td><td>a</td><td>0.362991 ± 0.000014</td><td>13.42 ± 0.11</td><td>12 ± 6</td><td>a</td></tr><tr><td>0.166105 ± 0.000012</td><td>13.35 ± 0.06</td><td>20 ± 5</td><td>a</td><td>0.370224 ± 0.000033</td><td>13.02 ± 0.18</td><td>14 ± 14</td><td>a</td></tr><tr><td>0.180369 ± 0.000025</td><td>13.16 ± 0.10</td><td>28 ± 11</td><td>a</td><td>0.370595 ± 0.000037</td><td>13.26 ± 0.17</td><td>17 ± 14</td><td>a</td></tr><tr><td>0.196702 ± 0.000195</td><td>13.17 ± 0.82</td><td>31 ± 38</td><td>c</td><td>0.370827 ± 0.000026</td><td>13.28 ± 0.18</td><td>11 ± 11</td><td>a</td></tr><tr><td>0.196872 ± 0.000074</td><td>13.33 ± 0.57</td><td>23 ± 15</td><td>c</td><td>0.390113 ± 0.000010</td><td>13.78 ± 0.17</td><td>5 ± 1</td><td>a</td></tr><tr><td>0.197224 ± 0.000019</td><td>13.10 ± 0.09</td><td>20 ± 8</td><td>a</td><td>0.390952 ± 0.000014</td><td>13.44 ± 0.24</td><td>4 ± 2</td><td>a</td></tr><tr><td>0.209025 ± 0.000017</td><td>13.34 ± 0.21</td><td>10 ± 8</td><td>a</td><td>0.391399 ± 0.000038</td><td>13.25 ± 0.11</td><td>32 ± 13</td><td>a</td></tr><tr><td>0.219244 ± 0.000005</td><td>14.80 ± 0.03</td><td>35 ± 1</td><td>a</td><td>0.392143 ± 0.000026</td><td>13.40 ± 0.08</td><td>30 ± 8</td><td>a</td></tr><tr><td>0.232322 ± 0.000012</td><td>13.66 ± 0.06</td><td>20 ± 5</td><td>a</td><td>0.396282 ± 0.000025</td><td>13.28 ± 0.18</td><td>11 ± 11</td><td>a</td></tr><tr><td>0.232584 ± 0.000009</td><td>13.81 ± 0.14</td><td>15 ± 4</td><td>a</td><td>0.399075 ± 0.000025</td><td>13.44 ± 0.08</td><td>30 ± 8</td><td>a</td></tr><tr><td>0.240138 ± 0.000018</td><td>13.39 ± 0.38</td><td>7 ± 6</td><td>a</td><td>0.403674 ± 0.000025</td><td>13.07 ± 0.22</td><td>8 ± 12</td><td>a</td></tr><tr><td>0.241623 ± 0.000016</td><td>13.61 ± 0.05</td><td>32 ± 6</td><td>a</td><td>0.410308 ± 0.000006</td><td>14.66 ± 0.03</td><td>29 ± 1</td><td>a</td></tr><tr><td>0.245815 ± 0.000025</td><td>13.13 ± 0.10</td><td>24 ± 10</td><td>a</td><td>0.432596 ± 0.000018</td><td>13.39 ± 0.09</td><td>16 ± 6</td><td>a</td></tr><tr><td>0.270943 ± 0.000017</td><td>13.73 ± 0.04</td><td>42 ± 6</td><td>a</td><td>0.742566 ± 0.000008</td><td>15.82 ± 0.08</td><td>15 ± 1</td><td>a</td></tr><tr><td>0.278673 ± 0.000045</td><td>13.33 ± 0.13</td><td>36 ± 17</td><td>a</td><td>0.756892 ± 0.000019</td><td>14.61 ± 0.08</td><td>15 ± 5</td><td>b</td></tr><tr><td>0.279029 ± 0.000018</td><td>13.71 ± 0.07</td><td>27 ± 7</td><td>a</td><td>0.779674 ± 0.000013</td><td>15.01 ± 0.04</td><td>22 ± 3</td><td>b</td></tr></tbody></table>

Notes. (1) and (5): H1 redshift. (2) and (6): H1 column density from Voigt profile fitting. (3) and (7): H1 Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) ‘secure’; (b) ‘probable’; and (c) ‘uncertain’ (see Section 4.3 for definitions). See Section 4 for further details.
<table><caption>Table A7. H<sub>I</sub> absorption systems in QSO J135726.27+043541.4.</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H1</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H1</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.017131 ± 0.000257</td><td>13.91 ± 0.73</td><td>61 ± 42</td><td>c</td><td>0.146421 ± 0.000008</td><td>13.63 ± 0.04</td><td>22 ± 3</td><td>a</td></tr><tr><td>0.017248 ± 0.000014</td><td>14.08 ± 0.34</td><td>24 ± 15</td><td>b</td><td>0.151118 ± 0.000006</td><td>14.15 ± 0.28</td><td>16 ± 4</td><td>a</td></tr><tr><td>0.017598 ± 0.000126</td><td>13.40 ± 0.81</td><td>50 ± 103</td><td>c</td><td>0.151308 ± 0.000008</td><td>13.63 ± 0.41</td><td>8 ± 5</td><td>a</td></tr><tr><td>0.018668 ± 0.000011</td><td>13.37 ± 0.07</td><td>16 ± 6</td><td>b</td><td>0.153161 ± 0.000014</td><td>13.40 ± 0.05</td><td>30 ± 6</td><td>a</td></tr><tr><td>0.018958 ± 0.000060</td><td>13.24 ± 0.26</td><td>33 ± 27</td><td>b</td><td>0.153593 ± 0.000018</td><td>13.10 ± 0.09</td><td>17 ± 8</td><td>a</td></tr><tr><td>0.019134 ± 0.000011</td><td>13.77 ± 0.15</td><td>14 ± 5</td><td>b</td><td>0.157750 ± 0.000006</td><td>13.76 ± 0.04</td><td>23 ± 3</td><td>a</td></tr><tr><td>0.020295 ± 0.000029</td><td>13.46 ± 0.06</td><td>64 ± 13</td><td>b</td><td>0.162888 ± 0.000008</td><td>13.25 ± 0.06</td><td>13 ± 4</td><td>a</td></tr><tr><td>0.021041 ± 0.000016</td><td>13.14 ± 0.09</td><td>17 ± 8</td><td>b</td><td>0.163266 ± 0.000010</td><td>13.76 ± 0.02</td><td>49 ± 4</td><td>a</td></tr><tr><td>0.027518 ± 0.000011</td><td>14.22 ± 0.13</td><td>22 ± 4</td><td>b</td><td>0.164861 ± 0.000007</td><td>13.33 ± 0.07</td><td>12 ± 3</td><td>a</td></tr><tr><td>0.027706 ± 0.000022</td><td>13.73 ± 0.11</td><td>25 ± 7</td><td>b</td><td>0.168903 ± 0.000004</td><td>13.81 ± 0.07</td><td>15 ± 2</td><td>a</td></tr><tr><td>0.028369 ± 0.000027</td><td>12.96 ± 0.11</td><td>29 ± 14</td><td>b</td><td>0.175061 ± 0.000005</td><td>14.52 ± 0.18</td><td>28 ± 3</td><td>a</td></tr><tr><td>0.028676 ± 0.000008</td><td>13.33 ± 0.06</td><td>14 ± 4</td><td>b</td><td>0.177385 ± 0.000006</td><td>13.68 ± 0.06</td><td>16 ± 2</td><td>a</td></tr><tr><td>0.029380 ± 0.000012</td><td>13.40 ± 0.04</td><td>33 ± 5</td><td>b</td><td>0.178242 ± 0.000007</td><td>13.46 ± 0.05</td><td>16 ± 3</td><td>a</td></tr><tr><td>0.031349 ± 0.000005</td><td>13.82 ± 0.84</td><td>8 ± 5</td><td>c</td><td>0.179023 ± 0.000027</td><td>13.36 ± 0.06</td><td>54 ± 10</td><td>a</td></tr><tr><td>0.032295 ± 0.000031</td><td>13.23 ± 0.07</td><td>58 ± 14</td><td>b</td><td>0.180886 ± 0.000008</td><td>13.24 ± 0.05</td><td>16 ± 4</td><td>a</td></tr><tr><td>0.034097 ± 0.000008</td><td>13.66 ± 0.03</td><td>36 ± 3</td><td>b</td><td>0.181865 ± 0.000016</td><td>13.02 ± 0.07</td><td>20 ± 6</td><td>a</td></tr><tr><td>0.036035 ± 0.000004</td><td>14.08 ± 1.10</td><td>9 ± 6</td><td>c</td><td>0.192283 ± 0.000019</td><td>13.16 ± 0.07</td><td>30 ± 8</td><td>a</td></tr><tr><td>0.039034 ± 0.000010</td><td>13.05 ± 0.07</td><td>12 ± 6</td><td>b</td><td>0.194326 ± 0.000022</td><td>13.14 ± 0.08</td><td>30 ± 9</td><td>a</td></tr><tr><td>0.039644 ± 0.000006</td><td>13.38 ± 0.07</td><td>12 ± 4</td><td>b</td><td>0.195296 ± 0.000016</td><td>13.17 ± 0.06</td><td>27 ± 6</td><td>a</td></tr><tr><td>0.039952 ± 0.000024</td><td>13.09 ± 0.08</td><td>38 ± 12</td><td>b</td><td>0.200185 ± 0.000006</td><td>13.37 ± 0.19</td><td>8 ± 4</td><td>a</td></tr><tr><td>0.041771 ± 0.000008</td><td>13.21 ± 0.07</td><td>12 ± 4</td><td>b</td><td>0.200989 ± 0.000006</td><td>13.43 ± 0.06</td><td>13 ± 3</td><td>a</td></tr><tr><td>0.042824 ± 0.000014</td><td>13.54 ± 0.08</td><td>15 ± 5</td><td>b</td><td>0.202453 ± 0.000012</td><td>13.48 ± 0.03</td><td>40 ± 5</td><td>a</td></tr><tr><td>0.042974 ± 0.000009</td><td>14.01 ± 0.23</td><td>14 ± 8</td><td>b</td><td>0.207167 ± 0.000004</td><td>13.74 ± 0.04</td><td>17 ± 2</td><td>a</td></tr><tr><td>0.043146 ± 0.000011</td><td>14.08 ± 0.07</td><td>21 ± 5</td><td>b</td><td>0.210506 ± 0.000014</td><td>13.01 ± 0.06</td><td>19 ± 6</td><td>a</td></tr><tr><td>0.043397 ± 0.000005</td><td>14.95 ± 2.39</td><td>13 ± 11</td><td>c</td><td>0.216074 ± 0.000007</td><td>13.98 ± 0.02</td><td>51 ± 2</td><td>a</td></tr><tr><td>0.043605 ± 0.000009</td><td>13.90 ± 0.04</td><td>25 ± 3</td><td>b</td><td>0.227233 ± 0.000010</td><td>13.64 ± 0.03</td><td>35 ± 4</td><td>a</td></tr><tr><td>0.045631 ± 0.000007</td><td>14.08 ± 0.02</td><td>44 ± 3</td><td>b</td><td>0.244937 ± 0.000012</td><td>13.27 ± 0.06</td><td>18 ± 5</td><td>a</td></tr><tr><td>0.048113 ± 0.000006</td><td>14.38 ± 0.22</td><td>27 ± 4</td><td>b</td><td>0.246303 ± 0.000005</td><td>14.76 ± 0.07</td><td>36 ± 2</td><td>a</td></tr><tr><td>0.051101 ± 0.000011</td><td>13.45 ± 0.44</td><td>8 ± 8</td><td>b</td><td>0.247041 ± 0.000035</td><td>13.11 ± 0.11</td><td>35 ± 15</td><td>a</td></tr><tr><td>0.051261 ± 0.000008</td><td>13.97 ± 1.89</td><td>9 ± 11</td><td>c</td><td>0.248581 ± 0.000008</td><td>13.59 ± 0.06</td><td>16 ± 3</td><td>a</td></tr><tr><td>0.051461 ± 0.000032</td><td>13.56 ± 0.21</td><td>19 ± 12</td><td>b</td><td>0.249060 ± 0.000020</td><td>13.13 ± 0.08</td><td>21 ± 8</td><td>a</td></tr><tr><td>0.051839 ± 0.000013</td><td>13.22 ± 0.13</td><td>11 ± 8</td><td>b</td><td>0.261583 ± 0.000014</td><td>13.29 ± 0.04</td><td>32 ± 5</td><td>a</td></tr><tr><td>0.052407 ± 0.000015</td><td>13.81 ± 0.04</td><td>54 ± 6</td><td>b</td><td>0.281688 ± 0.000024</td><td>13.16 ± 0.17</td><td>15 ± 10</td><td>a</td></tr><tr><td>0.059531 ± 0.000018</td><td>13.66 ± 0.04</td><td>54 ± 7</td><td>b</td><td>0.286326 ± 0.000011</td><td>13.24 ± 0.13</td><td>9 ± 5</td><td>a</td></tr><tr><td>0.060329 ± 0.000013</td><td>13.30 ± 0.07</td><td>19 ± 6</td><td>b</td><td>0.298699 ± 0.000073</td><td>13.35 ± 0.10</td><td>80 ± 23</td><td>a</td></tr><tr><td>0.076092 ± 0.000009</td><td>13.76 ± 0.12</td><td>15 ± 5</td><td>b</td><td>0.304720 ± 0.000045</td><td>13.96 ± 0.05</td><td>97 ± 15</td><td>a</td></tr><tr><td>0.076345 ± 0.000011</td><td>14.00 ± 0.04</td><td>36 ± 5</td><td>b</td><td>0.328657 ± 0.000002</td><td>16.90 ± 0.05</td><td>21 ± 1</td><td>a</td></tr><tr><td>0.078359 ± 0.000026</td><td>13.36 ± 0.12</td><td>26 ± 10</td><td>b</td><td>0.343123 ± 0.000015</td><td>13.51 ± 0.06</td><td>24 ± 5</td><td>a</td></tr><tr><td>0.078661 ± 0.000012</td><td>14.06 ± 0.04</td><td>39 ± 5</td><td>b</td><td>0.346126 ± 0.000016</td><td>13.73 ± 0.05</td><td>36 ± 5</td><td>a</td></tr><tr><td>0.080128 ± 0.000030</td><td>13.59 ± 0.06</td><td>69 ± 12</td><td>b</td><td>0.359820 ± 0.000020</td><td>13.52 ± 0.05</td><td>35 ± 6</td><td>a</td></tr><tr><td>0.082165 ± 0.000018</td><td>13.34 ± 0.12</td><td>13 ± 9</td><td>b</td><td>0.361673 ± 0.000015</td><td>13.55 ± 0.05</td><td>28 ± 5</td><td>a</td></tr><tr><td>0.082351 ± 0.000010</td><td>14.13 ± 0.20</td><td>19 ± 5</td><td>b</td><td>0.362677 ± 0.000024</td><td>13.59 ± 0.05</td><td>48 ± 8</td><td>a</td></tr><tr><td>0.083518 ± 0.000021</td><td>13.07 ± 0.11</td><td>17 ± 10</td><td>b</td><td>0.379567 ± 0.000026</td><td>13.83 ± 0.05</td><td>60 ± 8</td><td>a</td></tr><tr><td>0.084793 ± 0.000017</td><td>13.18 ± 0.09</td><td>18 ± 8</td><td>b</td><td>0.392532 ± 0.000031</td><td>13.45 ± 0.12</td><td>20 ± 9</td><td>a</td></tr><tr><td>0.087177 ± 0.000024</td><td>13.33 ± 0.06</td><td>48 ± 10</td><td>b</td><td>0.392760 ± 0.000039</td><td>13.24 ± 0.21</td><td>18 ± 16</td><td>a</td></tr><tr><td>0.090972 ± 0.000009</td><td>13.60 ± 0.04</td><td>31 ± 4</td><td>b</td><td>0.415130 ± 0.000009</td><td>14.21 ± 0.03</td><td>44 ± 3</td><td>a</td></tr><tr><td>0.094005 ± 0.000008</td><td>13.38 ± 0.06</td><td>15 ± 4</td><td>b</td><td>0.417115 ± 0.000024</td><td>13.41 ± 0.07</td><td>32 ± 8</td><td>a</td></tr><tr><td>0.103056 ± 0.000047</td><td>13.82 ± 0.05</td><td>127 ± 15</td><td>b</td><td>0.420397 ± 0.000035</td><td>13.41 ± 0.17</td><td>17 ± 9</td><td>a</td></tr><tr><td>0.103308 ± 0.000009</td><td>13.60 ± 0.13</td><td>13 ± 5</td><td>b</td><td>0.423283 ± 0.000016</td><td>13.16 ± 0.19</td><td>8 ± 7</td><td>a</td></tr><tr><td>0.104201 ± 0.000013</td><td>13.49 ± 0.05</td><td>26 ± 5</td><td>b</td><td>0.428928 ± 0.000021</td><td>13.45 ± 0.06</td><td>29 ± 7</td><td>a</td></tr><tr><td>0.105164 ± 0.000009</td><td>13.77 ± 0.03</td><td>39 ± 4</td><td>b</td><td>0.429242 ± 0.000014</td><td>13.36 ± 0.08</td><td>14 ± 5</td><td>a</td></tr><tr><td>0.105844 ± 0.000017</td><td>13.68 ± 0.04</td><td>64 ± 7</td><td>b</td><td>0.442389 ± 0.000004</td><td>15.11 ± 0.04</td><td>20 ± 1</td><td>a</td></tr><tr><td>0.112071 ± 0.000023</td><td>13.23 ± 0.09</td><td>31 ± 10</td><td>a</td><td>0.447281 ± 0.000031</td><td>13.60 ± 0.07</td><td>40 ± 9</td><td>a</td></tr><tr><td>0.112358 ± 0.000006</td><td>14.03 ± 0.15</td><td>18 ± 3</td><td>a</td><td>0.448193 ± 0.000018</td><td>13.40 ± 0.12</td><td>14 ± 7</td><td>a</td></tr><tr><td>0.118585 ± 0.000007</td><td>13.63 ± 0.04</td><td>24 ± 3</td><td>a</td><td>0.448902 ± 0.000012</td><td>13.72 ± 0.08</td><td>17 ± 4</td><td>a</td></tr><tr><td>0.120039 ± 0.000301</td><td>13.30 ± 1.22</td><td>39 ± 51</td><td>c</td><td>0.509743 ± 0.000050</td><td>13.83 ± 0.25</td><td>20 ± 14</td><td>a</td></tr><tr><td>0.120219 ± 0.000136</td><td>13.43 ± 0.89</td><td>32 ± 22</td><td>c</td><td>0.510026 ± 0.000018</td><td>14.58 ± 0.05</td><td>30 ± 4</td><td>a</td></tr><tr><td>0.134505 ± 0.000017</td><td>13.58 ± 0.05</td><td>42 ± 7</td><td>a</td><td>0.512396 ± 0.000066</td><td>14.13 ± 0.10</td><td>75 ± 25</td><td>a</td></tr><tr><td>0.139534 ± 0.000015</td><td>13.49 ± 0.05</td><td>37 ± 6</td><td>a</td><td>0.609922 ± 0.000031</td><td>14.56 ± 0.09</td><td>27 ± 7</td><td>a</td></tr><tr><td>0.140135 ± 0.000012</td><td>13.47 ± 0.05</td><td>26 ± 5</td><td>a</td><td>0.610275 ± 0.000010</td><td>15.34 ± 0.03</td><td>28 ± 2</td><td>a</td></tr><tr><td>0.146072 ± 0.000006</td><td>14.07 ± 0.03</td><td>32 ± 2</td><td>a</td><td>0.640542 ± 0.000013</td><td>15.01 ± 0.06</td><td>36 ± 4</td><td>a</td></tr></tbody></table>
<table><caption>**Table A7 – continued**</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.683699 ± 0.000009</td><td>15.14 ± 0.04</td><td>25 ± 2</td><td>a</td><td>0.941398 ± 0.000103</td><td>14.68 ± 92.02</td><td>11 ± 365</td><td>c</td></tr><tr><td>0.817042 ± 0.000009</td><td>15.57 ± 0.03</td><td>31 ± 2</td><td>a</td><td>0.943130 ± 0.000041</td><td>14.33 ± 0.03</td><td>93 ± 11</td><td>a</td></tr><tr><td>0.818074 ± 0.000042</td><td>14.53 ± 0.11</td><td>27 ± 11</td><td>a</td><td>0.945935 ± 0.000026</td><td>15.36 ± 0.61</td><td>83 ± 21</td><td>c</td></tr><tr><td>0.819486 ± 0.000006</td><td>16.08 ± 0.02</td><td>36 ± 1</td><td>a</td><td>0.968540 ± 0.000025</td><td>13.81 ± 0.02</td><td>76 ± 7</td><td>a</td></tr><tr><td>0.820566 ± 0.000014</td><td>15.00 ± 0.01</td><td>21 ± 3</td><td>a</td><td>1.047058 ± 0.000062</td><td>13.91 ± 0.04</td><td>59 ± 18</td><td>a</td></tr><tr><td>0.843079 ± 0.000025</td><td>15.00 ± 0.01</td><td>30 ± 6</td><td>a</td><td>1.048416 ± 0.000096</td><td>13.61 ± 0.07</td><td>45 ± 34</td><td>a</td></tr><tr><td>0.886303 ± 0.000029</td><td>14.16 ± 0.02</td><td>112 ± 7</td><td>a</td><td>1.050351 ± 0.000049</td><td>13.92 ± 0.03</td><td>72 ± 14</td><td>a</td></tr><tr><td>0.889956 ± 0.000035</td><td>13.85 ± 0.03</td><td>57 ± 12</td><td>a</td><td>1.089823 ± 0.000041</td><td>13.98 ± 0.16</td><td>35 ± 16</td><td>a</td></tr><tr><td>0.897971 ± 0.000090</td><td>14.40 ± 0.05</td><td>135 ± 22</td><td>a</td><td>1.158147 ± 0.000086</td><td>13.84 ± 0.19</td><td>37 ± 31</td><td>a</td></tr><tr><td>0.908724 ± 0.000030</td><td>14.23 ± 0.02</td><td>90 ± 8</td><td>a</td><td>1.182535 ± 0.000092</td><td>13.86 ± 0.05</td><td>88 ± 24</td><td>a</td></tr></tbody></table>

*Notes.* (1) and (5): H1 redshift. (2) and (6): H1 column density from Voigt profile fitting. (3) and (7): H1 Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) 'secure'; (b) 'probable'; and (c) 'uncertain' (see Section 4.3 for definitions). See Section 4 for further details.

<table><caption>**Table A8. H1 absorption systems in QSO J221806.67+005223.6.**</caption><thead><tr><th>z<br>(1)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(2)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(3)</th><th>Label<br>(4)</th><th>z<br>(5)</th><th>log (N<sub>H</sub>/cm<sup>-2</sup>)<br>(6)</th><th>b<sub>H</sub> (km s<sup>-1</sup>)<br>(7)</th><th>Label<br>(8)</th></tr></thead><tbody><tr><td>0.788733 ± 0.000049</td><td>14.22 ± 0.02</td><td>142 ± 13</td><td>b</td><td>0.948039 ± 0.000071</td><td>14.30 ± 1.07</td><td>36 ± 60</td><td>c</td></tr><tr><td>0.801500 ± 0.000096</td><td>14.21 ± 0.06</td><td>111 ± 26</td><td>b</td><td>0.999144 ± 0.000091</td><td>13.86 ± 0.04</td><td>112 ± 23</td><td>b</td></tr><tr><td>0.809249 ± 0.000097</td><td>14.28 ± 0.04</td><td>183 ± 24</td><td>b</td><td>1.012488 ± 0.000108</td><td>13.81 ± 0.06</td><td>87 ± 28</td><td>b</td></tr><tr><td>0.839592 ± 0.000086</td><td>14.19 ± 0.13</td><td>61 ± 30</td><td>b</td><td>1.015784 ± 0.000103</td><td>14.08 ± 0.04</td><td>148 ± 24</td><td>b</td></tr><tr><td>0.841663 ± 0.000058</td><td>15.05 ± 0.61</td><td>94 ± 38</td><td>c</td><td>1.048160 ± 0.000030</td><td>14.84 ± 0.08</td><td>71 ± 5</td><td>a</td></tr><tr><td>0.844030 ± 0.000089</td><td>14.12 ± 0.09</td><td>72 ± 28</td><td>b</td><td>1.051686 ± 0.000080</td><td>14.04 ± 0.04</td><td>121 ± 18</td><td>a</td></tr><tr><td>0.878483 ± 0.000117</td><td>15.58 ± 2.87</td><td>96 ± 99</td><td>c</td><td>1.083814 ± 0.000088</td><td>14.99 ± 15.67</td><td>26 ± 151</td><td>c</td></tr><tr><td>0.886827 ± 0.006759</td><td>14.18 ± 21.99</td><td>90 ± 390</td><td>c</td><td>1.084660 ± 0.000347</td><td>14.11 ± 0.14</td><td>190 ± 38</td><td>a</td></tr><tr><td>0.887010 ± 0.003798</td><td>14.19 ± 21.18</td><td>65 ± 989</td><td>c</td><td>1.093294 ± 0.000056</td><td>14.28 ± 1.64</td><td>27 ± 39</td><td>c</td></tr><tr><td>0.919839 ± 0.000787</td><td>13.68 ± 0.42</td><td>147 ± 143</td><td>b</td><td>1.098911 ± 0.000068</td><td>14.00 ± 0.35</td><td>33 ± 27</td><td>a</td></tr><tr><td>0.921107 ± 0.000234</td><td>13.73 ± 0.36</td><td>77 ± 45</td><td>b</td><td>1.130129 ± 0.000042</td><td>15.23 ± 0.56</td><td>24 ± 6</td><td>c</td></tr><tr><td>0.944475 ± 0.000473</td><td>14.00 ± 0.13</td><td>315 ± 106</td><td>b</td><td>1.213798 ± 0.000032</td><td>14.51 ± 0.30</td><td>39 ± 9</td><td>a</td></tr><tr><td>0.947890 ± 0.000220</td><td>14.18 ± 0.13</td><td>191 ± 62</td><td>b</td><td>1.217410 ± 0.000024</td><td>15.88 ± 0.59</td><td>70 ± 12</td><td>c</td></tr></tbody></table>

*Notes.* (1) and (5): H1 redshift. (2) and (6): H1 column density from Voigt profile fitting. (3) and (7): H1 Doppler parameter from Voigt profile fitting. (4) and (8): Confidence label: (a) 'secure'; (b) 'probable'; and (c) 'uncertain' (see Section 4.3 for definitions). See Section 4 for further details.
<table><caption>**Table A9.** Spectroscopic catalogue of objects in the Q0107 field.</caption><thead><tr><th>RA<br>(°)<br>(1)</th><th>Dec.<br>(°)<br>(2)</th><th>z<br>(3)</th><th>z-label<br>(4)</th><th>Spec. type<br>(5)</th><th>R<br>(mag)<br>(6)</th><th>CLASS_STAR<br>(7)</th><th>Instrument<br>(8)</th></tr></thead><tbody><tr><td>17.38011</td><td>-2.45953</td><td>-</td><td>c</td><td>None</td><td>22.04 ± 0.02</td><td>0.89</td><td>VIMOS</td></tr><tr><td>17.38029</td><td>-2.44843</td><td>-</td><td>c</td><td>None</td><td>21.58 ± 0.01</td><td>0.91</td><td>VIMOS</td></tr><tr><td>17.38067</td><td>-2.39631</td><td>-</td><td>c</td><td>None</td><td>22.86 ± 0.03</td><td>0.85</td><td>VIMOS</td></tr><tr><td>17.38092</td><td>-2.29300</td><td>-</td><td>c</td><td>None</td><td>22.76 ± 0.06</td><td>0.01</td><td>VIMOS</td></tr><tr><td>17.38147</td><td>-2.45457</td><td>-</td><td>c</td><td>None</td><td>20.60 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.38153</td><td>-2.28402</td><td>0.8206</td><td>a</td><td>SF</td><td>22.62 ± 0.03</td><td>0.22</td><td>VIMOS</td></tr><tr><td>17.38383</td><td>-2.30767</td><td>-</td><td>c</td><td>None</td><td>22.85 ± 0.05</td><td>0.87</td><td>VIMOS</td></tr><tr><td>17.38384</td><td>-2.31244</td><td>0.2070</td><td>a</td><td>SF</td><td>21.49 ± 0.01</td><td>0.91</td><td>VIMOS</td></tr><tr><td>17.38433</td><td>-2.42912</td><td>0.5758</td><td>a</td><td>SF</td><td>21.85 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>17.38459</td><td>-2.38049</td><td>0.5658</td><td>a</td><td>SF</td><td>21.46 ± 0.01</td><td>0.11</td><td>VIMOS</td></tr><tr><td>17.38593</td><td>-2.42506</td><td>-</td><td>c</td><td>None</td><td>21.88 ± 0.03</td><td>0.72</td><td>VIMOS</td></tr><tr><td>17.38661</td><td>-2.27211</td><td>0.1908</td><td>a</td><td>Non-SF</td><td>18.48 ± 0.01</td><td>0.62</td><td>VIMOS</td></tr><tr><td>17.38672</td><td>-2.43483</td><td>0.2604</td><td>a</td><td>SF</td><td>22.25 ± 0.04</td><td>0.04</td><td>VIMOS</td></tr><tr><td>17.38769</td><td>-2.39048</td><td>0.1898</td><td>a</td><td>Non-SF</td><td>18.92 ± 0.01</td><td>0.04</td><td>VIMOS</td></tr><tr><td>17.38899</td><td>-2.38348</td><td>0.4298</td><td>a</td><td>Non-SF</td><td>19.57 ± 0.01</td><td>0.04</td><td>VIMOS</td></tr><tr><td>17.38948</td><td>-2.46353</td><td>-</td><td>c</td><td>None</td><td>22.78 ± 0.06</td><td>0.15</td><td>VIMOS</td></tr><tr><td>17.38948</td><td>-2.28029</td><td>-</td><td>c</td><td>None</td><td>22.40 ± 0.02</td><td>0.12</td><td>VIMOS</td></tr><tr><td>17.39174</td><td>-2.23779</td><td>0.8750</td><td>b</td><td>SF</td><td>21.92 ± 0.02</td><td>0.06</td><td>VIMOS</td></tr><tr><td>17.39238</td><td>-2.32387</td><td>0.3228</td><td>a</td><td>SF</td><td>19.35 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.39346</td><td>-2.26905</td><td>0.5678</td><td>b</td><td>SF</td><td>22.00 ± 0.02</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.39372</td><td>-2.26188</td><td>-</td><td>c</td><td>None</td><td>23.22 ± 0.04</td><td>0.92</td><td>VIMOS</td></tr><tr><td>17.39382</td><td>-2.26352</td><td>0.1235</td><td>a</td><td>SF</td><td>20.76 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.39425</td><td>-2.32939</td><td>0.1858</td><td>a</td><td>SF</td><td>20.60 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.39534</td><td>-2.22252</td><td>0.4318</td><td>b</td><td>SF</td><td>21.52 ± 0.01</td><td>0.34</td><td>VIMOS</td></tr><tr><td>17.39548</td><td>-2.46720</td><td>0.4318</td><td>a</td><td>SF</td><td>21.51 ± 0.01</td><td>0.57</td><td>VIMOS</td></tr><tr><td>17.39580</td><td>-2.32021</td><td>-</td><td>c</td><td>None</td><td>22.84 ± 0.04</td><td>0.92</td><td>VIMOS</td></tr><tr><td>17.39689</td><td>-2.32676</td><td>-</td><td>c</td><td>None</td><td>22.78 ± 0.05</td><td>0.10</td><td>VIMOS</td></tr><tr><td>17.39936</td><td>-2.44477</td><td>-</td><td>c</td><td>None</td><td>21.03 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.40124</td><td>-2.25178</td><td>-</td><td>c</td><td>None</td><td>22.86 ± 0.04</td><td>0.02</td><td>VIMOS</td></tr><tr><td>17.40169</td><td>-2.41860</td><td>-</td><td>c</td><td>None</td><td>22.95 ± 0.04</td><td>0.05</td><td>VIMOS</td></tr><tr><td>17.40238</td><td>-2.36791</td><td>0.7214</td><td>b</td><td>SF</td><td>22.92 ± 0.05</td><td>0.76</td><td>VIMOS</td></tr><tr><td>17.40259</td><td>-2.24309</td><td>0.5698</td><td>a</td><td>SF</td><td>22.66 ± 0.03</td><td>0.79</td><td>VIMOS</td></tr><tr><td>17.40325</td><td>-2.25935</td><td>0.0000</td><td>b</td><td>Star</td><td>20.68 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.40331</td><td>-2.27535</td><td>0.7548</td><td>a</td><td>SF</td><td>21.84 ± 0.02</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.40371</td><td>-2.25559</td><td>-</td><td>c</td><td>None</td><td>19.75 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.40562</td><td>-2.22848</td><td>-</td><td>c</td><td>None</td><td>21.72 ± 0.01</td><td>0.25</td><td>VIMOS</td></tr><tr><td>17.40621</td><td>-2.39338</td><td>0.7564</td><td>a</td><td>SF</td><td>22.67 ± 0.04</td><td>0.77</td><td>VIMOS</td></tr><tr><td>17.40647</td><td>-2.44007</td><td>0.0000</td><td>a</td><td>Star</td><td>18.79 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>17.40670</td><td>-2.30130</td><td>0.5778</td><td>b</td><td>SF</td><td>21.37 ± 0.02</td><td>0.02</td><td>VIMOS</td></tr><tr><td>17.40800</td><td>-2.24577</td><td>0.5710</td><td>a</td><td>SF</td><td>20.94 ± 0.01</td><td>0.87</td><td>VIMOS</td></tr><tr><td>17.40895</td><td>-2.29587</td><td>0.4693</td><td>a</td><td>Non-SF</td><td>21.61 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>17.40936</td><td>-2.40779</td><td>0.5125</td><td>b</td><td>SF</td><td>21.93 ± 0.02</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.40966</td><td>-2.29878</td><td>0.4318</td><td>b</td><td>SF</td><td>21.90 ± 0.01</td><td>0.73</td><td>VIMOS</td></tr><tr><td>17.41028</td><td>-2.41474</td><td>0.0768</td><td>a</td><td>SF</td><td>17.72 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>17.41158</td><td>-2.28715</td><td>0.0000</td><td>a</td><td>Star</td><td>20.31 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr></tbody></table>

Notes. Only a portion of this table is shown. The full table is available in the online version of the paper. (1) Right ascension (J2000). (2) Declination (J2000). (3) Redshift. (4) Redshift label: secure ('a'), possible ('b'), no idea ('c'), undefined ('n'). (5) Spectral type: star-forming galaxy ('SF'), non-star-forming ('non-SF'), star ('star'), active galactic nuclei ('AGN'), undefined ('none'). (6) R-band magnitude (MAG_AUTO) given by SEXTRACTOR; we note that these uncertainties might be underestimated by a factor of ~3. (7) CLASS_STAR given by SEXTRACTOR. (8) Instrument. See Section s for further details.
<table><caption>Table A10. Spectroscopic catalogue of objects in the J1005 field.</caption><thead><tr><th>RA<br>(°)<br>(1)</th><th>Dec.<br>(°)<br>(2)</th><th>z<br>(3)</th><th>z-label<br>(4)</th><th>Spec. type<br>(5)</th><th>R<br>(mag)<br>(6)</th><th>CLASS_STAR<br>(7)</th><th>Instrument<br>(8)</th></tr></thead><tbody><tr><td>151.20469</td><td>1.66112</td><td>—</td><td>c</td><td>None</td><td>22.13 ± 0.03</td><td>0.00</td><td>VIMOS</td></tr><tr><td>151.20507</td><td>1.64756</td><td>−0.0001</td><td>a</td><td>Star</td><td>21.69 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.20593</td><td>1.57977</td><td>0.5020</td><td>a</td><td>SF</td><td>22.04 ± 0.02</td><td>0.57</td><td>VIMOS</td></tr><tr><td>151.20654</td><td>1.46163</td><td>—</td><td>c</td><td>None</td><td>21.76 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.20737</td><td>1.52252</td><td>0.3741</td><td>a</td><td>SF</td><td>22.30 ± 0.02</td><td>0.90</td><td>VIMOS</td></tr><tr><td>151.20745</td><td>1.44131</td><td>—</td><td>c</td><td>None</td><td>21.07 ± 0.01</td><td>0.01</td><td>VIMOS</td></tr><tr><td>151.20786</td><td>1.59262</td><td>0.6756</td><td>a</td><td>SF</td><td>22.88 ± 0.05</td><td>0.00</td><td>VIMOS</td></tr><tr><td>151.20786</td><td>1.65663</td><td>0.6171</td><td>a</td><td>SF</td><td>22.01 ± 0.03</td><td>0.02</td><td>VIMOS</td></tr><tr><td>151.20807</td><td>1.51942</td><td>0.3758</td><td>a</td><td>SF</td><td>21.99 ± 0.02</td><td>0.07</td><td>VIMOS</td></tr><tr><td>151.20824</td><td>1.61967</td><td>—</td><td>c</td><td>None</td><td>21.16 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.20876</td><td>1.65437</td><td>0.4140</td><td>a</td><td>SF</td><td>21.10 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>151.20898</td><td>1.60191</td><td>−0.0003</td><td>a</td><td>Star</td><td>22.30 ± 0.02</td><td>0.96</td><td>VIMOS</td></tr><tr><td>151.20899</td><td>1.60833</td><td>0.1833</td><td>a</td><td>SF</td><td>20.15 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>151.21012</td><td>1.43022</td><td>0.0007</td><td>a</td><td>Star</td><td>21.14 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.21039</td><td>1.49978</td><td>0.6186</td><td>a</td><td>SF</td><td>22.18 ± 0.02</td><td>0.52</td><td>VIMOS</td></tr><tr><td>151.21094</td><td>1.48094</td><td>0.3369</td><td>b</td><td>SF</td><td>20.21 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>151.21137</td><td>1.56292</td><td>0.4217</td><td>a</td><td>SF</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>151.21501</td><td>1.45867</td><td>−0.0002</td><td>a</td><td>Star</td><td>22.54 ± 0.02</td><td>0.95</td><td>VIMOS</td></tr><tr><td>151.21624</td><td>1.66290</td><td>0.4349</td><td>a</td><td>Non-SF</td><td>19.99 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>151.21690</td><td>1.46603</td><td>0.0004</td><td>b</td><td>Star</td><td>22.21 ± 0.02</td><td>0.96</td><td>VIMOS</td></tr><tr><td>151.21765</td><td>1.60560</td><td>0.3046</td><td>b</td><td>SF</td><td>20.63 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>151.21766</td><td>1.51071</td><td>0.2668</td><td>a</td><td>SF</td><td>21.46 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>151.21860</td><td>1.62702</td><td>0.3607</td><td>a</td><td>Non-SF</td><td>20.61 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.21912</td><td>1.47104</td><td>0.2784</td><td>a</td><td>SF</td><td>21.62 ± 0.02</td><td>0.10</td><td>VIMOS</td></tr><tr><td>151.21917</td><td>1.46904</td><td>0.8439</td><td>a</td><td>SF</td><td>21.37 ± 0.01</td><td>0.79</td><td>VIMOS</td></tr><tr><td>151.22008</td><td>1.59780</td><td>−0.0006</td><td>b</td><td>Star</td><td>19.84 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.22048</td><td>1.59640</td><td>0.3799</td><td>a</td><td>SF</td><td>21.13 ± 0.01</td><td>0.37</td><td>VIMOS</td></tr><tr><td>151.22182</td><td>1.63121</td><td>0.3408</td><td>a</td><td>SF</td><td>22.21 ± 0.02</td><td>0.44</td><td>VIMOS</td></tr><tr><td>151.22212</td><td>1.66830</td><td>0.4357</td><td>a</td><td>Non-SF</td><td>19.41 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>151.20108</td><td>1.49272</td><td>0.0010</td><td>a</td><td>Star</td><td>18.97 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.20265</td><td>1.61368</td><td>1.2043</td><td>b</td><td>SF</td><td>23.28 ± 0.05</td><td>0.66</td><td>VIMOS</td></tr><tr><td>151.20276</td><td>1.43851</td><td>0.1284</td><td>b</td><td>SF</td><td>22.56 ± 0.03</td><td>0.15</td><td>VIMOS</td></tr><tr><td>151.20418</td><td>1.44580</td><td>0.9792</td><td>b</td><td>Non-SF</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>151.20418</td><td>1.44879</td><td>—</td><td>c</td><td>None</td><td>23.00 ± 0.04</td><td>0.70</td><td>VIMOS</td></tr><tr><td>151.22541</td><td>1.62459</td><td>0.5973</td><td>a</td><td>SF</td><td>22.29 ± 0.03</td><td>0.15</td><td>VIMOS</td></tr><tr><td>151.22703</td><td>1.57367</td><td>0.1773</td><td>a</td><td>SF</td><td>20.43 ± 0.01</td><td>0.04</td><td>VIMOS</td></tr><tr><td>151.22793</td><td>1.50934</td><td>—</td><td>c</td><td>None</td><td>23.07 ± 0.05</td><td>0.00</td><td>VIMOS</td></tr><tr><td>151.22802</td><td>1.64551</td><td>0.4308</td><td>a</td><td>SF</td><td>22.23 ± 0.02</td><td>0.15</td><td>VIMOS</td></tr><tr><td>151.22852</td><td>1.47628</td><td>0.4130</td><td>a</td><td>SF</td><td>21.24 ± 0.01</td><td>0.97</td><td>VIMOS</td></tr><tr><td>151.22882</td><td>1.48978</td><td>1.2499</td><td>b</td><td>AGN</td><td>21.68 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.23032</td><td>1.67427</td><td>0.4658</td><td>a</td><td>SF</td><td>21.16 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>151.23139</td><td>1.47889</td><td>—</td><td>c</td><td>None</td><td>20.40 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.23440</td><td>1.50143</td><td>0.0984</td><td>a</td><td>SF</td><td>21.45 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>151.23440</td><td>1.50273</td><td>0.9504</td><td>b</td><td>SF</td><td>23.16 ± 0.04</td><td>0.26</td><td>VIMOS</td></tr><tr><td>151.23517</td><td>1.60390</td><td>0.6915</td><td>a</td><td>SF</td><td>22.23 ± 0.03</td><td>0.01</td><td>VIMOS</td></tr></tbody></table>

Notes. Only a portion of this table is shown. The full table is available in the online version of the paper. (1) Right ascension (J2000). (2) Declination (J2000). (3) Redshift. (4) Redshift label: secure ('a'), possible ('b'), no idea ('c'), undefined ('n'). (5) Spectral type: star-forming galaxy ('SF'), non-star-forming ('non-SF'), star ('star'), active galactic nuclei ('AGN'), undefined ('none'). (6) R-band magnitude (MAG_AUTO) given by SEXTRACTOR; we note that these uncertainties might be underestimated by a factor of ~3. (7) CLASS_STAR given by SEXTRACTOR. (8) Instrument. See Section 5 for further details.
<table><caption>Table A11. Spectroscopic catalogue of objects in the J1022 field.</caption><thead><tr><th>R.A.<br>(degrees)<br>(1)</th><th>Dec.<br>(degrees)<br>(2)</th><th>z</th><th>z-label</th><th>Spec. type<br>(5)</th><th>R<br>(mag)<br>(6)</th><th>CLASS_STAR<br>(7)</th><th>Instrument<br>(8)</th></tr><tr><th></th><th></th><th>(3)</th><th>(4)</th><th></th><th></th><th></th><th></th></tr></thead><tbody><tr><td>155.37715</td><td>1.39655</td><td>0.8507</td><td>a</td><td>SF</td><td>21.53 ± 0.02</td><td>0.00</td><td>VIMOS</td></tr><tr><td>155.38284</td><td>1.41530</td><td>1.1483</td><td>b</td><td>SF</td><td>23.39 ± 0.06</td><td>0.00</td><td>VIMOS</td></tr><tr><td>155.38420</td><td>1.40041</td><td>0.0000</td><td>a</td><td>Star</td><td>20.79 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>155.38583</td><td>1.47086</td><td>0.6002</td><td>a</td><td>Non-SF</td><td>21.43 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>155.38706</td><td>1.48588</td><td>0.5856</td><td>b</td><td>Non-SF</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>155.38832</td><td>1.46557</td><td>0.6024</td><td>a</td><td>Non-SF</td><td>21.82 ± 0.02</td><td>0.13</td><td>VIMOS</td></tr><tr><td>155.38857</td><td>1.40637</td><td>— 0.0001</td><td>a</td><td>Star</td><td>21.86 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>155.38882</td><td>1.45225</td><td>0.5859</td><td>a</td><td>SF</td><td>21.92 ± 0.02</td><td>0.42</td><td>VIMOS</td></tr><tr><td>155.38967</td><td>1.48727</td><td>0.5850</td><td>a</td><td>SF</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>155.39031</td><td>1.45981</td><td>0.3872</td><td>a</td><td>Non-SF</td><td>21.95 ± 0.02</td><td>0.19</td><td>VIMOS</td></tr><tr><td>155.39137</td><td>1.44240</td><td>0.2793</td><td>a</td><td>SF</td><td>22.00 ± 0.02</td><td>0.03</td><td>VIMOS</td></tr><tr><td>155.39313</td><td>1.37581</td><td>0.3280</td><td>a</td><td>SF</td><td>22.76 ± 0.03</td><td>0.05</td><td>VIMOS</td></tr><tr><td>155.39317</td><td>1.38055</td><td>0.5095</td><td>a</td><td>SF</td><td>21.71 ± 0.01</td><td>0.14</td><td>VIMOS</td></tr><tr><td>155.39435</td><td>1.43998</td><td>—</td><td>c</td><td>None</td><td>21.64 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>155.39496</td><td>1.44664</td><td>0.8356</td><td>a</td><td>AGN</td><td>20.79 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>155.39525</td><td>1.45809</td><td>0.5434</td><td>a</td><td>SF</td><td>22.62 ± 0.03</td><td>0.01</td><td>VIMOS</td></tr><tr><td>155.39590</td><td>1.41016</td><td>0.3792</td><td>a</td><td>SF</td><td>21.85 ± 0.02</td><td>0.02</td><td>VIMOS</td></tr><tr><td>155.39685</td><td>1.47371</td><td>0.3886</td><td>a</td><td>Non-SF</td><td>20.79 ± 0.01</td><td>0.04</td><td>VIMOS</td></tr><tr><td>155.39896</td><td>1.39150</td><td>0.3822</td><td>a</td><td>SF</td><td>20.52 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>155.40109</td><td>1.43295</td><td>1.1802</td><td>a</td><td>SF</td><td>22.39 ± 0.03</td><td>0.17</td><td>VIMOS</td></tr><tr><td>155.40404</td><td>1.42086</td><td>0.0001</td><td>a</td><td>Star</td><td>20.06 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>155.40579</td><td>1.46164</td><td>0.4315</td><td>b</td><td>Non-SF</td><td>21.78 ± 0.01</td><td>0.40</td><td>VIMOS</td></tr><tr><td>155.40968</td><td>1.48033</td><td>0.3387</td><td>a</td><td>SF</td><td>22.10 ± 0.03</td><td>0.00</td><td>VIMOS</td></tr><tr><td>155.40993</td><td>1.38644</td><td>0.5379</td><td>a</td><td>SF</td><td>21.64 ± 0.01</td><td>0.63</td><td>VIMOS</td></tr><tr><td>155.41473</td><td>1.42251</td><td>0.2704</td><td>a</td><td>SF</td><td>22.32 ± 0.02</td><td>0.96</td><td>VIMOS</td></tr><tr><td>155.41755</td><td>1.48266</td><td>—</td><td>c</td><td>None</td><td>20.59 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>155.41755</td><td>1.48306</td><td>0.6919</td><td>a</td><td>SF</td><td>20.59 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>155.42122</td><td>1.41347</td><td>0.5490</td><td>a</td><td>SF</td><td>20.92 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>155.42184</td><td>1.45377</td><td>0.7426</td><td>b</td><td>Non-SF</td><td>22.24 ± 0.03</td><td>0.00</td><td>VIMOS</td></tr><tr><td>155.42204</td><td>1.50142</td><td>0.7131</td><td>a</td><td>SF</td><td>21.65 ± 0.02</td><td>0.00</td><td>VIMOS</td></tr><tr><td>155.42233</td><td>1.47884</td><td>— 0.0001</td><td>a</td><td>Star</td><td>20.88 ± 0.01</td><td>0.15</td><td>VIMOS</td></tr><tr><td>155.42239</td><td>1.50883</td><td>0.2774</td><td>a</td><td>SF</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>155.42247</td><td>1.46069</td><td>0.6690</td><td>a</td><td>SF</td><td>22.38 ± 0.03</td><td>0.00</td><td>VIMOS</td></tr><tr><td>155.42297</td><td>1.49994</td><td>0.0001</td><td>a</td><td>Star</td><td>21.24 ± 0.01</td><td>0.07</td><td>VIMOS</td></tr><tr><td>155.42303</td><td>1.64718</td><td>0.0001</td><td>a</td><td>Star</td><td>22.18 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>155.42307</td><td>1.44942</td><td>0.9721</td><td>b</td><td>AGN</td><td>21.17 ± 0.01</td><td>0.88</td><td>VIMOS</td></tr><tr><td>155.42318</td><td>1.42447</td><td>0.0003</td><td>a</td><td>Star</td><td>20.24 ± 0.01</td><td>0.94</td><td>VIMOS</td></tr><tr><td>155.42378</td><td>1.43253</td><td>—</td><td>c</td><td>None</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>155.42378</td><td>1.43483</td><td>0.3786</td><td>a</td><td>SF</td><td>22.80 ± 0.03</td><td>0.04</td><td>VIMOS</td></tr><tr><td>155.42421</td><td>1.59549</td><td>0.2793</td><td>b</td><td>SF</td><td>21.56 ± 0.02</td><td>0.01</td><td>VIMOS</td></tr><tr><td>155.42462</td><td>1.65111</td><td>—</td><td>c</td><td>None</td><td>22.36 ± 0.02</td><td>0.97</td><td>VIMOS</td></tr><tr><td>155.42480</td><td>1.57184</td><td>0.3838</td><td>a</td><td>Non-SF</td><td>19.88 ± 0.01</td><td>0.03</td><td>VIMOS</td></tr><tr><td>155.42488</td><td>1.63062</td><td>0.2604</td><td>a</td><td>SF</td><td>23.17 ± 0.04</td><td>0.14</td><td>VIMOS</td></tr><tr><td>155.42488</td><td>1.58274</td><td>0.3730</td><td>a</td><td>SF</td><td>22.37 ± 0.03</td><td>0.01</td><td>VIMOS</td></tr><tr><td>155.42501</td><td>1.57854</td><td>0.2211</td><td>a</td><td>SF</td><td>21.24 ± 0.01</td><td>0.09</td><td>VIMOS</td></tr></tbody></table>

Notes. Only a portion of this table is shown. The full table is available in the online version of the paper. (1) Right ascension (J2000). (2) Declination (J2000). (3) Redshift. (4) Redshift label: secure ('a'), possible ('b'), no idea ('c'), undefined ('n'). (5) Spectral type: star-forming galaxy ('SF'), non-star-forming ('non-SF'), star ('star'), active galactic nuclei ('AGN'), undefined ('none'). (6) R-band magnitude (MAG_AUTO) given by SEXTRACTOR; we note that these uncertainties might be underestimated by a factor of ~3. (7) CLASS_STAR given by SEXTRACTOR. (8) Instrument. See Section 5 for further details.
<table><caption>**Table A12.** Spectroscopic catalogue of objects in the J2218 field.</caption><thead><tr><th>RA<br>(°)<br>(1)</th><th>Dec.<br>(°)<br>(2)</th><th>z<br>(3)</th><th>z-label<br>(4)</th><th>Spec. type<br>(5)</th><th>R<br>(mag)<br>(6)</th><th>CLASS_STAR<br>(7)</th><th>Instrument<br>(8)</th></tr></thead><tbody><tr><td>334.33420</td><td>0.88225</td><td>—</td><td>c</td><td>None</td><td>22.66 ± 0.06</td><td>0.76</td><td>VIMOS</td></tr><tr><td>334.33427</td><td>0.87096</td><td>0.7139</td><td>a</td><td>SF</td><td>22.48 ± 0.06</td><td>0.06</td><td>VIMOS</td></tr><tr><td>334.33532</td><td>0.76281</td><td>−0.0007</td><td>a</td><td>Star</td><td>21.45 ± 0.02</td><td>0.95</td><td>VIMOS</td></tr><tr><td>334.33539</td><td>0.95526</td><td>−0.0006</td><td>a</td><td>Star</td><td>20.36 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.33540</td><td>0.87713</td><td>−0.0001</td><td>a</td><td>Star</td><td>21.14 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.33540</td><td>0.87816</td><td>—</td><td>c</td><td>None</td><td>21.14 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.33553</td><td>0.89967</td><td>0.2770</td><td>a</td><td>SF</td><td>19.98 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>334.33776</td><td>0.94074</td><td>−0.0008</td><td>a</td><td>Star</td><td>21.05 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.33805</td><td>0.75379</td><td>0.4266</td><td>a</td><td>Non-SF</td><td>20.18 ± 0.01</td><td>0.06</td><td>VIMOS</td></tr><tr><td>334.33840</td><td>0.89023</td><td>−0.0003</td><td>a</td><td>Star</td><td>20.48 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.33872</td><td>0.86856</td><td>−0.0002</td><td>a</td><td>Star</td><td>22.82 ± 0.06</td><td>0.73</td><td>VIMOS</td></tr><tr><td>334.34238</td><td>0.85964</td><td>0.0000</td><td>a</td><td>Star</td><td>21.57 ± 0.02</td><td>0.97</td><td>VIMOS</td></tr><tr><td>334.34268</td><td>0.95394</td><td>0.3552</td><td>a</td><td>SF</td><td>20.23 ± 0.01</td><td>0.02</td><td>VIMOS</td></tr><tr><td>334.34329</td><td>0.80460</td><td>—</td><td>c</td><td>None</td><td>22.33 ± 0.05</td><td>0.88</td><td>VIMOS</td></tr><tr><td>334.34470</td><td>0.80777</td><td>0.5634</td><td>b</td><td>SF</td><td>22.03 ± 0.04</td><td>0.45</td><td>VIMOS</td></tr><tr><td>334.34497</td><td>0.81192</td><td>−0.0006</td><td>a</td><td>Star</td><td>21.33 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.34497</td><td>0.81424</td><td>—</td><td>c</td><td>None</td><td>22.04 ± 0.04</td><td>0.16</td><td>VIMOS</td></tr><tr><td>334.34521</td><td>0.80232</td><td>0.2780</td><td>b</td><td>Non-SF</td><td>21.17 ± 0.02</td><td>0.24</td><td>VIMOS</td></tr><tr><td>334.34639</td><td>0.94785</td><td>—</td><td>c</td><td>None</td><td>21.87 ± 0.04</td><td>0.16</td><td>VIMOS</td></tr><tr><td>334.34675</td><td>0.72373</td><td>—</td><td>c</td><td>None</td><td>21.52 ± 0.04</td><td>0.00</td><td>VIMOS</td></tr><tr><td>334.34679</td><td>0.70623</td><td>—</td><td>c</td><td>None</td><td>21.64 ± 0.03</td><td>0.97</td><td>VIMOS</td></tr><tr><td>334.34808</td><td>0.86693</td><td>—</td><td>c</td><td>None</td><td>22.62 ± 0.07</td><td>0.09</td><td>VIMOS</td></tr><tr><td>334.34811</td><td>0.72829</td><td>—</td><td>c</td><td>None</td><td>21.43 ± 0.03</td><td>0.01</td><td>VIMOS</td></tr><tr><td>334.34837</td><td>0.90869</td><td>—</td><td>c</td><td>None</td><td>20.85 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.34899</td><td>0.74437</td><td>—</td><td>c</td><td>None</td><td>21.08 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.34957</td><td>0.71501</td><td>2.6775</td><td>b</td><td>AGN</td><td>20.71 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.35004</td><td>0.73447</td><td>0.5102</td><td>a</td><td>SF</td><td>21.49 ± 0.03</td><td>0.01</td><td>VIMOS</td></tr><tr><td>334.35004</td><td>0.73733</td><td>—</td><td>c</td><td>None</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>334.35029</td><td>0.77934</td><td>—</td><td>c</td><td>None</td><td>21.11 ± 0.02</td><td>0.01</td><td>VIMOS</td></tr><tr><td>334.35062</td><td>0.93009</td><td>—</td><td>c</td><td>None</td><td>21.87 ± 0.05</td><td>0.00</td><td>VIMOS</td></tr><tr><td>334.35116</td><td>0.89441</td><td>0.5197</td><td>a</td><td>Non-SF</td><td>20.90 ± 0.02</td><td>0.04</td><td>VIMOS</td></tr><tr><td>334.35170</td><td>0.76951</td><td>0.2519</td><td>a</td><td>SF</td><td>22.05 ± 0.05</td><td>0.01</td><td>VIMOS</td></tr><tr><td>334.35180</td><td>0.79917</td><td>0.0001</td><td>a</td><td>Star</td><td>22.98 ± 0.07</td><td>0.73</td><td>VIMOS</td></tr><tr><td>334.35212</td><td>0.78120</td><td>−0.0010</td><td>a</td><td>Star</td><td>19.11 ± 0.01</td><td>0.90</td><td>VIMOS</td></tr><tr><td>334.35303</td><td>0.96757</td><td>−0.0010</td><td>a</td><td>Star</td><td>20.74 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.35317</td><td>0.71804</td><td>—</td><td>c</td><td>None</td><td>20.84 ± 0.02</td><td>0.42</td><td>VIMOS</td></tr><tr><td>334.35417</td><td>0.91667</td><td>—</td><td>c</td><td>None</td><td>20.37 ± 0.02</td><td>0.01</td><td>VIMOS</td></tr><tr><td>334.35472</td><td>0.81685</td><td>−0.0005</td><td>a</td><td>Star</td><td>19.54 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.35482</td><td>0.85446</td><td>—</td><td>c</td><td>None</td><td>20.40 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.35491</td><td>0.78289</td><td>0.4486</td><td>b</td><td>Non-SF</td><td>21.54 ± 0.03</td><td>0.34</td><td>VIMOS</td></tr><tr><td>334.35506</td><td>0.74805</td><td>—</td><td>c</td><td>None</td><td>21.14 ± 0.02</td><td>0.97</td><td>VIMOS</td></tr><tr><td>334.35588</td><td>0.90488</td><td>—</td><td>c</td><td>None</td><td>20.56 ± 0.01</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.35620</td><td>0.75890</td><td>−0.0002</td><td>a</td><td>Star</td><td>—</td><td>—</td><td>VIMOS</td></tr><tr><td>334.35620</td><td>0.76016</td><td>—</td><td>c</td><td>None</td><td>21.08 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr><tr><td>334.35643</td><td>0.89244</td><td>0.0004</td><td>a</td><td>Star</td><td>21.08 ± 0.02</td><td>0.98</td><td>VIMOS</td></tr></tbody></table>

Notes. Only a portion of this table is shown. The full table is available in the online version of the paper. (1) Right ascension (J2000). (2) Declination (J2000). (3) Redshift. (4) Redshift label: secure ('a'), possible ('b'), no idea ('c'), undefined ('n'). (5) Spectral type: star-forming galaxy ('SF'), non-star-forming ('non-SF'), star ('star'), active galactic nuclei ('AGN'), undefined ('none'). (6) R-band magnitude (MAG_AUTO) given by SEXTRACTOR; we note that these uncertainties might be underestimated by a factor of ~3. (7) CLASS_STAR given by SEXTRACTOR. (8) Instrument. See Section 5 for further details.

## SUPPORTING INFORMATION

Additional Supporting Information may be found in the online version of this article:

**Table A9.** Spectroscopic catalogue of objects in the Q0107 field.

**Table A10.** Spectroscopic catalogue of objects in the J1005 field.

**Table A11.** Spectroscopic catalogue of objects in the J1022 field.

**Table A12.** Spectroscopic catalogue of objects in the J2218 field.

(http://mnras.oxfordjournals.org/lookup/suppl/doi:10.1093/mnras/stt1844/-/DC1).

Please note: Oxford University Press are not responsible for the content or functionality of any supporting materials supplied by the authors. Any queries (other than missing material) should be directed to the corresponding author for the article.

This paper has been typeset from a TeX/LA TeX file prepared by the author.