Comparison between the reddening assumed for the programme stars in the region of the Upper Scorpius – Ophiuchus cloud and other estimates. Upper panel: with the intensity of the emission as measured by the Planck mission. Lower panel: with the total reddening in the g − r colour and in that direction obtained from the map by Green et al. (2019); the dashed red line is the expected relation between E(B − V) and E(g − r) (Schlafly & Finkbeiner 2011). Only objects with E(B − V) > 0.1 are plotted here. In both panels the size of the points is related to the distance from the Sun (largest symbols are for the farthest stars).