Disk-integrated H2CO spectra using a 5.6″ circular aperture. H2CO 303–202, H2CO 322–221, and H2CO 321–220 are at y-offsets of 0, 0.25, and 0.5 Jy, respectively, shown in dashed gray lines. The vertical dashed red line shows the systemic velocity. The spectra are Hanning smoothed to 0.336 km s-1 channels.
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