Population of simulated AC and uncontaminated clusters in the output XAMIN parameter space. Top panel: distribution of AC sources (pink crosses) compared with uncontaminated clusters (green circles). Bottom panel: distribution of AC sources and uncontaminated clusters shaded according to the EPN_RATIO parameter. The red line highlights the EPN_STAT_PNT > 20 cut. Dark shaded circles above the red line indicate pure clusters that are separable from the AC population due to their having an EPN_RATIO ≤ 0.2.