Galaxy NGC 4996 (J130931+005125) detected as an additional, non‐ISIB96 object in one of the fields of the test sample. The galaxy (as seen in the SDSS field) is shown in the left panel. It is truncated by the field border. In order to "restore" the truncated part, we assumed point symmetry. The resulting "restored" image is shown in the right panel. The difference between the magnitude calculated within the original mask and the one calculated for the "restored" image is Δm(g*) = 0.22 mag.