map. τ250 is derived from Herschel maps. τ250 map is convolved to the same 60 resolution as map. Areas where τ250 < 0.0003 are masked. Contours for 4, 3, 1.5, and 0.75 are marked with red line. Contours for τ250 = 0.0052, 0.0039, 0.0019, and 0.0010 are marked with black line.
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