Planck 2013 results
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Fig. 22


E(BV) measured with quasars in the diffuse ISM at high Galactic latitude as a function of (upper) and τ353 (lower). Each point is the average of E(BV) values in a bin of τ353 or . The bin size varies for each bin such that there is always the same number of samples per bin (N = 1000). The error bar is the standard deviation of E(BV) values in the bin, divided by . The solid line is the linear regression fit to the whole sample; E(BV)/ℛ = (5.40 ± 0.09) × 105 and E(BV) /τ353 = (1.49 ± 0.03) × 104. In each case, the intercept is small (–0.0040 for and 0.0048 for τ353), in accordance with the fact that the zero levels of E(BV) (i.e., the intrinsic colours) and of the Planck and IRIS data were estimated using a correlation with NH i.

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