Density distribution of all false cases (FP+FN). We present the density distribution for CNN V-1 and V-2 in the panels, respectively. The false cases are analysed as a function of surface brightness and snapshot lookback time. This arrangement allows for a detailed examination of the interplay between these parameters in the context of false cases. The total number of false cases (FC_tot) is 32 and 18, respectively. This is normalised with the number of false cases and the number of the test sample (210 images).