Table A.3
Laboratory parameters of CH3CN and HNCO and the intensity integrated over the width of each line 
, which is used for rotation diagrams in Fig. 4.
| Mol. | Freq. | K | I(300 K) | E L | S ul μ 2 | o-/p- | MM1 | MM2 | IRS1−mmS | Note |
| (GHz) | Log10 | (cm-1) | (D2) | (K km s-1) | (K km s-1) | (K km s-1) | ||||
|
|
||||||||||
| CH3CN (J = 12 → 11) | 220.476 | 8 | −3.098 | 357.938 | 205.033 | p- | 24.76 ± 2.50 | 5.53 ± 0.09 | 38.15 ± 0.92 | 1, 2, 3 |
| 220.539 | 7 | −2.868 | 283.608 | 243.499 | p- | 32.99 ± 2.60 | 13.07 ± 0.16 | 46.61 ± 4.02 | ||
| 220.594 | 6 | −2.377 | 219.154 | 553.690 | o- | 129.85 ± 10.78 | 60.20 ± 0.08 | 166.07 ± 2.04 | ||
| 220.641 | 5 | −2.522 | 164.592 | 305.047 | p- | 109.82 ± 4.97 | 36.07 ± 0.18 | 165.53 ± 11.26 | ||
| 220.679 | 4 | −2.397 | 119.933 | 328.188 | p- | 105.81 ± 3.19 | 39.42 ± 0.22 | 225.55 ± 3.57 | ||
| 220.709 | 3 | −2.001 | 85.187 | 692.234 | o- | 173.43 ± 7.99 | 66.98 ± 0.72 | 287.13 ± 2.31 | ||
| 220.730 | 2 | −2.234 | 60.363 | 358.988 | p- | 136.57 ± 1.93 | 46.87 ± 1.40 | 280.88 ± 3.92 | ||
| 220.743 | 1 | −2.194 | 45.467 | 366.614 | p- | 143.27 ± 31.70 | 54.19 ± 0.70 | 301.46 ± 4.56 | ||
| 220.747 | 0 | −2.180 | 40.501 | 369.277 | p- | 155.20 ± 31.70 | 58.70 ± 0.70 | 326.57 ± 4.56 | ||
|
|
||||||||||
| HNCO | 218.981 | −2.677 | 62.949 | 70.596 | 35.32 ± 1.11 | 17.38 ± 0.19 | 88.86 ± 3.25 | 1, 2, 4, 5 | ||
| 219.656 | −3.232 | 293.596 | 59.063 | 3.41 ± 0.04 | 3.86 ± 0.03 | 8.49 ± 0.49 | ||||
| 219.737 | −2.887 | 151.337 | 66.110 | 25.47 ± 0.12∗ | 14.07 ± 0.09∗ | 46.96 ± 0.24∗ | ||||
| 219.798 | −2.602 | 32.994 | 72.127 | 65.23 ± 0.60 | 36.89 ± 0.18 | 121.44 ± 6.06 | ||||
Notes. Uncertainties on the measured intensities are typically ≤10% as determined from Gaussian fit. 1. Integrated intensities are obtained by Gildas “Gaussian” fits. 2. Laboratory parameters are from CDMS. 3. Q(300 K, CH3CN) = 14683.6324. 4. Q(300 K, HNCO) = 7785.741. 5. “*” denotes the line with blending multiplets due to ourspectral resolution, and the values are giving by simply taking into account their relative weights.
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