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Fig. 14


Spitzer 3.6 μm surface brightness as the function of τ250 derived from Herschel data. The black circles show the median surface brightness in τ250 = 0.002 wide bands. The dashed red line is a robust least squares fit to the range τ250 = 0.0025–0.0065, with the slope, k, given at the bottom of the frame. The zero point of the Iν (3.6 μm) axis is arbitrary.

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