Density map of the S/N (computed as the ratio of the standard deviation over the root-mean-square of the G magnitude uncertainties) versus G magnitude for the sample of candidates modelled with only a cosine function (Sample 0GE). The contours delineate the density of sources in the sample 2GE-B (modelled with two Gaussians and an ellipsoidal component with large amplitude (see text). Six contours are shown on a linear scale of the density of sources on the map.