Redshift histograms (left side) and colour–magnitude diagrams (right side) of 2XMMp J120815.5+250001 (top), 2XMMp J123759.3+180332 (middle), and 2XMMp J133853.9+482033 (bottom). Objects with spectra are plotted in green, while the confirmed cluster members are shown in red. Error bars plotted in the colour–magnitude diagrams indicate the photometric uncertainties and are visible when they exceed the symbol size. Galaxies excluded by the iterative sigma clipping method are shown in purple in panels e and f.