Comparison of the XCO factors derived from dust and γ-ray measurements in mask0 as a function of the average dust optical depth at 353 GHz in the different clouds. The colours mark the use of different gas tracers: E(B − V) reddening in black, τ353 optical depth in blue, γ rays coupled to τ353 in magenta, and γ rays coupled to reddening in red.
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