Spectral window with several CH3OH lines from the single-dish (black lines, 0.2 MHz spectral resolution) and the 2” interferometric data (red line, 0.8 MHz spectral resolution). CH3OH lines with upper level energies higher than 70 K are marked with a star in the NGC 7538 IRS9 to emphasize the increase in SMA/IRAM overlapping for lines with higher upper energy levels.
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