Peak intensity contours (red) of the naturally weighted H2CO21,1−21,2 emission (θFWHM ≈ 1″) from 55 to 62 km s-1 in the e1/e2 region superposed on the Ku-band continuum image (θFWHM ≈ 0.33″). The contours are at 2, 4, 6 mJy/beam. The green circles show the apertures used for the spectra shown in Figs. 16 and 17. The larger apertures around e8mol and e10mol are e8mol_ext and e10mol_ext. The feature denoted “e2-e8 bridge” is a diffuse feature that is seen in the naturally-weighted but not in the robust-weighted images. e2a and e2b in this figure are both associated with the SMA and VLA source e2e (Shi et al. 2010b; Goddi et al. 2016). e2c is associated with the source e2nw.
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