a) Column density map (in cm-2) of the DR21 ridge with the crest as black dots and the black NH2 = 1023 cm-2 contour. Note that white pixels are undefined because of saturation. Blue ellipses give the position and extent (FWHM = semi-axes) of the Motte et al. (2007) dense cores. b), c) Radial column density profiles towards the crest locations b and c marked in yellow/blue in a). The radial profiles are averaged over the marked crest dots. The yellow areas show the ± 1σ ranges.
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