P–R curves of the schemes reported in Fig. 14, computed on the segmented removed zones (top) and the full Galactic plane (bottom). (a) P–R curves computed on the segmented 350.3–353.5°, which corresponds to the dense region that was removed from the patches data set. (b) P–R curves computed on the segmented 166.1–168.3°, which corresponds to the sparse region that we removed from the patches data set. (c) P–R curves computed on the full segmented Galactic plane. Unlike in Fig. 15b, P–R curves obtained on the latter are close to those obtained in Fig. 15a.