CO depletion factor towards IRDC C (left) and IRDC F (right) derived under the assumption that the kinetic temperature for the 13CO is 4 K less than for the 12CO. The contours give the mass surface density derived by Butler & Tan (2012) and are the same as in Fig. 1. The blue diamonds give the central locations of the C1-N, C1-S, F1, and F2 cores.
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