Fig. 29

Line shape difference between methanol (CH3OH) and methyl formate (CH3OCHO) towards MF4 for different transitions of methanol (in black; the upper state energy (K) and the torsional mode are indicated to the right) compared to the same methyl formate line (in red) for reference. The blue line marks the 9 km s-1 average velocity of the region.
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