Table 1: Main parameters for the cluster sample. The cluster denominations come from Vikhlinin et al. (1998, VMF) and Gilbank et al. (2004, XDCS). Coordinates are given with respect to the X-ray centroid. X-ray fluxes are taken from Mullis et al. (2003). \ensuremath {R_{\rm virial}} is the virial radius and $\sigma $ the velocity dispersion. N is the number of members identified in each cluster.
Field Cluster Alternative name RA Dec z $f_{\rm X}$ $L_{\rm X,bol}$ $\sigma $ \ensuremath {R_{\rm virial}} N
            [10-14 erg/s cm2] [1043 erg/s] [km s-1] [Mpc]  
R220 VMF194 RX J1729.0+7440 17:29:02 74:40:46 0.210 17.3 5.01 282 $\pm$ 52 0.742 8
  XDCS220 cmJ172333+7444101 17:23:33 74:44:10 0.261 0.3 0.14 621 $\pm$ 2712 1.535 15
R265 VMF131 RX  J1309.9+3222 13:09:56 32:22:31 0.294 9.0 6.03 476 $\pm$ 110 1.132 29
  VMF132 RX  J1313.2+3229 13:11:13 32:28:58 0.247 46.7 24.5 774 $\pm$ 150 1.945 18
R285 VMF73 RX  J0943.5+1640 09:43:32 16:40:02 0.254 23.1 12.3 661 $\pm$ 65 1.647 44
  VMF74 RX  J0943.7+1644 09:43:45 16:44:20 0.180 21.2 4.79 481 $\pm$ 79 1.313 34
1 Gilbank et al. (2004)
2 This value is likely overestimated, since the cluster does not seem to be in dynamical equilibrium, see text for details


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