Planck early results
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Fig.13

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Dust optical depth at 250 μm as a function of the column density NH computed from the NIR extinction map of Pineda et al. 2010 (shown on the lower right panel of our Fig. 2), for pixels with detected CO emission (W (CO) > 3 K kms-1). The black line shows the result of the linear regression: τ250 = 2.32 ×  10-25 ×  NH − 1.44 × 10-4.

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