Left: 2.5′  ×  2.5′R-band DSS image of NGC 4756 (top) and of NGC 5328 (bottom). Right: R map, of YZ projection of the selected snapshot, on the same scale as DSS image: 60 equispaced levels with density contrast equal to hundred, normalized to the total flux in the map; the lower panel shows the color distribution of different levels, from the maximum, red, to the minimum value, violet.