Fig. 3
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Maps of the column-density-weighted excitation temperature (left column), 13CO column density (middle column), and 13CO-derived mass surface density (right column) obtained for the four IRDCs (the top to bottom rows show G24.94-00.15, G23.46-00.53, G24.49-00.70, and G25.16-00.28). In each panel, the black contour corresponds to the FIR-derived mass surface density of 0.1 g cm−2.
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