Herschel maps of the DR21 environment showing a) 70 μm emission, b) column density, and c) dust temperature. The DR21 ridge is delimited roughly by the NH2 = 1023 cm-2 contour plotted in panels b) and c). The filaments selected using DisPerSE (see Sect. 3) are named and marked with dots along their crests in b) and c).
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