(top) The G327.29 B3 (cleanest) image is shown in greyscale with contours of the B6 data overlaid (orange: 3 mJy/beam, red: 20 mJy/beam). While the compact sources match well between the two bands, the HII region to the southwest appears only in B3. (lower panels) As in Figure H.12, these panels show Taylor terms 0 (left) and 1 (middle) and the spectral index α (right) of a cutout around the brightest core. The dust-dominated, compact source has a steep α ∼ 4, while the extended, free-free-dominated HII region has a flat index α ∼ 0. See also Fig. 2f of Paper I; Motte et al. (2022).