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Fig. 6

image

Rotational diagrams for CH3OH (upper panel), and CH3CHO (lower panel) derived using the emission lines observed towards B1b (see Table 1 and Fig. 3). The parameters Nu, gu, and Eup are the column density, the degeneracy, and the energy (with respect to the ground state of each symmetry), respectively, of the upperlevel. The derived values of the rotational temperature are reported in the panels.

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