Linear fitting of the color excess ﹩{E}_{{{\rm{G}}}_{\mathrm{BP}},{{\rm{G}}}_{\mathrm{RP}}}﹩ to the Planck/857 GHz intensity I 857GHz(102MJy sr−1) (top) and ﹩{E}_{\mathrm{NUV},{{\rm{G}}}_{\mathrm{BP}}}﹩ to I 857GHz(102MJy sr−1) (bottom). The grayscale decodes the source density, the red and magenta crosses denote the median values of each bin with small and large deviations from the linear fitting line (see Section 3.1.1 for details). The inset shows the distribution of the residuals with its median and standard deviation.