Comparison between the map of the reddening assumed for the programme stars in the region of the Upper Scorpius – Ophiuchus cloud (blobs) and the dust emission map from Planck mission (heat colour map in transparency). The area of the blobs is proportional to the assumed value for the reddening E(B − V). The highest value is E(B − V) = 0.994 mag for the B5III star HIP 80371 in the ρ Ophiuchi cloud.