Colour cuts operated on the AS1063 catalogues. In the left panel, we report the first cut (grey region marked by black boundaries) in the colour-colour plane V−I versus B−R. In the right panel, we report the cut (second cut), operated in the R band magnitude versus B−R colour plane, of the subsample extracted from the first cut. The selected objects in this panel are those above the black line. The "all-matched" entry in the legend, corresponding to the red points, indicates the objects in the photometric catalogue that have a match in the spectroscopic catalogue.