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Fig. 2.


Spectra of the 190–180 line of CH3CN, CH3CN v8 = 1, 13CH3CN, CH3 13CN, and CH3C15N in sources A and B. An LTE model for each species is overlaid in blue except for CH3CN where the emission is optically thick and therefore a good fit cannot be found. Blended species are labelled in the figure.

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