Image of the CH3CN emission using the 130 − 120 at 239.138 GHz line acquired by the SMA for the massive young stellar objects NGC 7538 IRS9, W3 IRS5, and AFGL490 targeted in this study. The black contour presents the 50% line intensity, and the synthesized beam is shown in white at the bottom left. A 2′′ radius mask used to extract the spectra is overplotted in dashed red line. Images for the hot core source NGC 7538 IRS1 is presented as well. The latter source has been through the same program as the three other sources.
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