Comparison of the 6 cm (greyscale plus white contour), 3.8 cm (magenta contour), and 1.3 cm (yellow contour) continuum emission maps generated with the common minimum UV distance of 13.3 kλ (see Sect. 3.1.3). Contour intervals for the cm maps and the submm map are the same as those in Figs. 1 and 2, respectively, where the 1σ noise levels are 0.23, 0.18, and 0.36 mJy beam^-1 and the beams 0''̣433  ×  0''̣321, 0''̣262  ×  0''̣195, and 0''̣344  ×  0''̣251, for the 6.0, 3.8, and 1.3 cm maps, respectively. The largest of the three beams is shown in the bottom right. The filled red rectangules and the double red circles indicate the peak positions of the 3 mm (Paper I) and 890 μm (Sect. 3.1.2) continuum emission, respectively. The filled green circles and light-blue triangles show the positions of the OH (Garay et al. 1985) and H₂O (Hofner & Churchwell 1996) masers, respectively. Labels A and C refer to the UC HII regions (notation as in Paper I and references therein). The filled yellow circle associated with the UC HII region C indicates the peak position of the isolated 7 mm emission seen in Fig. 1e close to the HMC.