E(B – V) from Planck Collaboration et al. (2014) plotted as a function of FUV for the NGP (plus signs) and the SGP (red diamonds), where the reddening has been averaged over the FUV bins. The straight line shows the relation derived by Boissier et al. (2015). The dashed lines show our best fit to the reddening for the NGP (black line) and the SGP (red line). Note that, in each case, an offset has been subtracted from the FUV to account for the non-cirrus emission.