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Fig. 2


Results of the rotational diagrams for CH3CN ν = 0, CH3CN ν8 = 1, CH3OCHO, HNCO, CH2DOH and aGg’-(CH2OH)2. The high rotation temperature fitted to the CH3CN ν = 0 rotational diagram is the consequence of the lines being optically thick and is not considered in our modeling (see Sect. 4.1). In the rotational diagram of the CH3CN ν8 = 1 vibrational state we use different symbols for: blended lines (empty circles), isolated or partially blended lines (filled circles), and the points with Erot> 400 K (triangles). The three straight lines correspond to the least squares fittings with all the points (black), only unblended lines (red), and unblended lines with Erot< 400 K (blue). For CH3OCHO, the points corresponding to the ν = 0 lines are indicated with filled circles and νt = 1 with empty circles. The parameters of the transitions used in the rotation diagrams are listed in Tables A.3A.8. Red points have not been used in the least squares fitting because they correspond to heavily blended lines.

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