Solid line: reddening free colour QUBI as a function of U − I as derived from the model atmospheres of Bessell et al. (1998) and reddened by the foreground extinction (see details in the text), whereas grey dots: stars in our catalogue. Only stars with U − I< 1 and QUBI< −0.1 (area inside the dashed lines) were used to generate our reddening map.
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