<table><caption>Table A.4. continued.</caption><thead><tr><th>No.</th><th>Set</th><th>Frequency (MHz)</th><th>Transition</th><th>E<sub>up</sub> (K)</th><th>Sμ<sup>2</sup> (D<sup>2</sup>)</th><th>sigma (K)</th><th>v (km s<sup>-1</sup>)</th><th>Δv<sub>1/2</sub> (km s<sup>-1</sup>)</th><th>T<sub>B</sub> (K)</th><th>W (K km s<sup>-1</sup>)</th><th>N<sub>up</sub>/g<sub>up</sub> (10<sup>12</sup> cm<sup>-2</sup>)</th><th>Source size (" × ")</th><th>PA(°)</th><th>Comments</th></tr><tr><th>(1)</th><th>(2)</th><th>(3)</th><th>(4)</th><th>(5)</th><th>(6)</th><th>(7)</th><th>(8)</th><th>(9)</th><th>(10)</th><th>(11)</th><th>(12)</th><th>(13)</th><th>(14)</th><th>(15)</th></tr></thead><tbody><tr><td>45</td><td>9</td><td>223782.081(0.007)</td><td>33<sub>6,28</sub>-33<sub>5,29</sub> E, (v<sub>t</sub> = 1)</td><td>543</td><td>7.0</td><td>0.27</td><td>-</td><td>-</td><td>≤0.81</td><td>≤1.7</td><td>≤0.09</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>46</td><td>9</td><td>223821.523(0.002)</td><td>35<sub>7,29</sub>-35<sub>6,30</sub> E</td><td>409</td><td>8.2</td><td>0.27</td><td>-</td><td>-</td><td>≤0.81</td><td>≤1.7</td><td>≤0.08</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>47</td><td>9</td><td>223854.201(0.100)</td><td>35<sub>7,29</sub>-35<sub>6,30</sub> A</td><td>409</td><td>10.1</td><td>0.27</td><td>-</td><td>-</td><td>≤0.81</td><td>≤1.7</td><td>≤0.06</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>48</td><td>10</td><td>225689.371(0.008)</td><td>34<sub>5,29</sub>-34<sub>5,30</sub> A, (v<sub>t</sub> = 1)</td><td>562</td><td>3.0</td><td>0.13</td><td>-</td><td>-</td><td>≤15.43</td><td>≤30.9</td><td>≤3.85</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>49</td><td>10</td><td>225696.842(0.100)</td><td>20<sub>1,19</sub>-19<sub>1,18</sub> E, (v<sub>t</sub> = 1)</td><td>307</td><td>50.2</td><td>0.13</td><td>-</td><td>-</td><td>≤13.25</td><td>≤26.5</td><td>≤0.20</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>50</td><td>10</td><td>225702.857(0.100)</td><td>19<sub>2,17</sub>-18<sub>2,16</sub> A, (v<sub>t</sub> = 1)</td><td>304</td><td>46.8</td><td>0.13</td><td>-</td><td>-</td><td>≤7.71</td><td>≤15.4</td><td>≤0.12</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>51</td><td>10</td><td>225727.506(0.100)</td><td>6<sub>6,1</sub>-5<sub>5,0</sub> A, (v<sub>t</sub> = 1)</td><td>224</td><td>3.1</td><td>0.13</td><td>-</td><td>-</td><td>≤0.90</td><td>≤1.8</td><td>≤0.21</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>52</td><td>10</td><td>225727.506(0.100)</td><td>6<sub>6,0</sub>-5<sub>5,1</sub> A, (v<sub>t</sub> = 1)</td><td>224</td><td>3.1</td><td>0.13</td><td>-</td><td>-</td><td>≤0.90</td><td>≤1.8</td><td>≤0.21</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>53</td><td>11</td><td>225855.505(0.100)</td><td>6<sub>6,1</sub>-5<sub>5,1</sub> E</td><td>36</td><td>3.1</td><td>0.08</td><td>-</td><td>-</td><td>≤1.20</td><td>≤2.4</td><td>≤0.29</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>54</td><td>11</td><td>225900.684(0.100)</td><td>6<sub>6,0</sub>-5<sub>5,0</sub> E</td><td>36</td><td>3.1</td><td>0.08</td><td>-</td><td>-</td><td>≤3.16</td><td>≤6.3</td><td>≤0.75</td><td>-</td><td>-</td><td>blend with HDO</td></tr><tr><td>55</td><td>11</td><td>225928.659(0.100)</td><td>6<sub>6,0</sub>-5<sub>5,1</sub> A</td><td>36</td><td>3.1</td><td>0.08</td><td>-</td><td>-</td><td>≤1.53</td><td>≤3.1</td><td>≤0.37</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>56</td><td>11</td><td>225928.659(0.100)</td><td>6<sub>6,1</sub>-5<sub>5,0</sub> A</td><td>36</td><td>3.1</td><td>0.08</td><td>-</td><td>-</td><td>≤1.53</td><td>≤3.1</td><td>≤0.37</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>57</td><td>12</td><td>225999.145(0.100)</td><td>30<sub>7,23</sub>-29<sub>8,22</sub> E</td><td>312</td><td>2.2</td><td>0.10</td><td>-</td><td>-</td><td>≤0.30</td><td>≤0.6</td><td>≤0.10</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>58</td><td>12</td><td>226061.796(0.100)</td><td>20<sub>3,17</sub>-19<sub>4,16</sub> E, (v<sub>t</sub> = 1)</td><td>321</td><td>4.0</td><td>0.10</td><td>-</td><td>-</td><td>≤0.30</td><td>≤0.6</td><td>≤0.06</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>59</td><td>12</td><td>226077.920(0.001)</td><td>10<sub>3,7</sub>-9<sub>1,8</sub> E</td><td>39</td><td>0.3</td><td>0.10</td><td>-</td><td>-</td><td>≤0.30</td><td>≤0.6</td><td>≤0.79</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>60</td><td>12</td><td>226081.175(0.002)</td><td>30<sub>7,23</sub>-29<sub>8,22</sub> A</td><td>312</td><td>1.8</td><td>0.10</td><td>-</td><td>-</td><td>≤0.30</td><td>≤0.6</td><td>≤0.12</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>61</td><td>12</td><td>226087.718(0.007)</td><td>29<sub>4,26</sub>-29<sub>3,27</sub> A, (v<sub>t</sub> = 1)</td><td>450</td><td>4.3</td><td>0.10</td><td>-</td><td>-</td><td>≤0.79</td><td>≤1.6</td><td>≤0.14</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>62</td><td>12</td><td>226090.301(0.100)</td><td>19<sub>2,17</sub>-18<sub>2,16</sub> E, (v<sub>t</sub> = 1)</td><td>303</td><td>47.0</td><td>0.10</td><td>-</td><td>-</td><td>≤1.00</td><td>≤2.0</td><td>≤0.02</td><td>-</td><td>-</td><td>blend</td></tr><tr><td>63</td><td>12</td><td>226112.470(0.007)</td><td>29<sub>4,26</sub>-29<sub>2,27</sub> A, (v<sub>t</sub> = 1)</td><td>450</td><td>2.1</td><td>0.10</td><td>-</td><td>-</td><td>≤0.30</td><td>≤0.6</td><td>≤0.11</td><td>-</td><td>-</td><td>not detected</td></tr><tr><td>64</td><td>12</td><td>226125.600(0.001)</td><td>10<sub>3,7</sub>-9<sub>1,8</sub> A</td><td>39</td><td>0.3</td><td>0.10</td><td>-</td><td>-</td><td>≤0.59</td><td>≤1.2</td><td>≤1.57</td><td>-</td><td>-</td><td>blend</td></tr></tbody></table>

Notes. (1) Observed transitions with $E_{\text{upper}} \le 650$ K. (2) Reference number of the corresponding data set (see Table 1). (3) Frequencies and uncertainties taken from Ilyushin et al. (2009) and from the JPL database (http://spec.jpl.nasa.gov/). (4) Transitions in ground state ($v_t = 0$). Transitions in torsional levels ($v_t = 1$) are specified. (5) Energy of the upper level. (6) Line strength calculated by Ilyushin et al. (2009). For the transitions coming from the JPL database, the line strength is calculated from the formulae of Pickett et al. (1998). (7) Noise estimated from spectrum ($1\sigma$). (8)–(11) Velocity, linewidth at half intensity, brightness temperature, and integrated intensities. The uncertainties are estimated with the CLASS software. (12) Column densities of the upper state of the transition with respect to the rotational degeneracy ($2J_{\text{up}} + 1$). (13) and (14) Source size estimated at half flux density from detected transitions with spatial resolution allowing isolation of the source. (15) Blended lines are specified.

C. Favre et al.: HCOOCH₃ as a probe of temperature and structure in Orion-KL