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Fig. A.2

image

Herschel-SPIRE 250 μm intensity, smoothed to 5, compared to Planck optical depth at 353 GHz. The red line is the linear relation I250 μm = 6.37 × 105τ353 GHz−1.46. The intercept of this relation was removed from the I250 μm map to set its zero level.

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