Dependence of the counterpart distances on the Galactic coordinates. Top: bins in which the control set is divided in Galactic coordinates. The legend specifies the number of control set sources in the bins. Bottom: distance distribution of the RASS counterparts at different Galactic coordinates. The solid red and blue histograms show the training set sources with |b| < 25° and |b| > 25°, respectively, and the dashed lines show the distances of the control set sources; the colors refer to the bins shown in the top panel.