Rotation diagrams for 13CH3OH (upper panel) and CH2DOH (lower panel). An emitting region size of is assumed (see text). The parameters Nu, gu, and Eup are the column density, the degeneracy, and the energy of the upper level, respectively. The derived value of the rotational temperature is reported for 13CH3OH. For CH2DOH the Trot derived from the 13C-isotopologues is assumed to derive the column density. The two CH2DOH transitions with excitation energies higher than 400 K as well as the Cycle 4 point are excluded from the fit, although they are in good agreement with it.
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