VLA image at 8.4 GHz of the same region than in Fig. 2 with color scale from − 0.1 to 0.7 mJy/beam. The dashed ellipse indicates the VLA primary beam and the green circle shows the IRAM 30 m beam at 102 GHz. The rms in this image stays large, of the order of 0.06 mJy/beam, due to strong sidelobes originating from to DR22, a strong radio source (a compact HII region) outside the imaged field (~5 arcmin south).