Fig. 1
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Spitzer 8 µm images (left column), Herschel-derived mass surface density maps (Σ; middle column) and dust temperature (Tdust; right column) for the four IRDCs. In the middle and right panels, the Σ=0.1 g cm−2 black contours highlight the shape of each cloud. The beam size (bottom left) and 1 pc scale bar (top right) are also indicated.
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