Voronoi tessellation diagrams of the region encompassing the five westernmost X-ray clusters (RA: 32.52, 33.13, Dec: –6.38, –6.05) as a function of redshift (0.2 <z< 1.1) with Voronoi polygons shown with lines and isophotes of X-ray surface brightness in contours. Each polygon contains only one galaxy, indicated by a black dot. The largest number of sources in the region of X-ray emissions are located in the redshift range 0.35 <z< 0.50. The levels of the X-ray contours are shown in green at 5.28, 7.02, 12.54 and 30 cts s^-1 deg ^-2 in the [0.5−2.5] keV range.