Comparison between optical point-like source density and far-IR emission in the central region (13.5 × 7.6 arcmin). Top panel: WHT image in the luminance L filter color coded in surface brightness according to the upper color bar. Middle panel: density of detected point-like sources in the region with WHT data. Lower panel: 250 μm counterpart with the Herschel space telescope. The image is color coded in S​_ν according to the lower color bar. The dashed lines mark elliptical surface brightness contours of approximately μ_L = 26 mag arcsec⁻² for the galaxies named in the top panel, and μ_L = 29.5 mag arcsec⁻² for the location of the Giant Coma Stream.