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Fig. 17.
Histogram of the XCO conversion factor derived from the ratio of the Herschel H2 column density and the line intensity of 12CO (1–0) (continuum line) and 13CO (1–0) (dotted line), pixel by pixel. The vertical lines indicate the mean values of 3.3 × 1020 cm−2 (K km s−1)−1 and 1.2 × 1021 cm−2 (K km s−1)−1.
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