Correlation plots between the dust optical depth atIRAS100μm (upper left),HFI857 GHz (upper right), 545 GHz (lower left) and 353 GHz (lower right) and the total gas column density in the solar neighbourhood (|bII| > 10°). The color scale represents the density of sky pixels on a log scale. The blue dots show a -binned average representation of the correlation. The red line shows the best linear correlation derived at low values (). The vertical lines show the positions corresponding to AV = 0.37mag and AV = 2.5mag. These figures are shown for a single XCO = 2.3 × 1020H2 cm-2/(K km s-1).
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