EXT vs. EXT_STAT plane for recovered clusters (red) and AGNs (blue). The continuous line in each panel at EXT_STAT = 33 shows the cut for the C1 selection and the dashed line at EXT_STAT = 15 shows the cut for the C2 selection. The continuous line at ext =5′′ shows the cut in extent for both the C1 and C2 selections. If a source is found in more than one tile or pointing, the detection with the highest value of EXT_STAT is shown. Panel a: single pointings; all sources. Panel b: tiles; all sources. Panel c: single pointings; off-axis angle > 9′. Panel d: tiles; off-axis angle >9′.