Density of the normalised differences of pairs of duplicate sources, as in Fig. 40, for the effective temperature (solid blue line), extinction (dotted green line), E(G_BP − G_RP) (solid orange line), radius (dashed red line) and luminosity (dot-dashed purple line). The normal distribution with 0. mean (shown as the vertical black line) and dispersion 1 is shown as the thick solid black line. The curves for extinction and reddening overlap perfectly.