Table 6: Results from the Dressler-Shectman test.
Cluster $z_{\rm cl}$ $N_{\rm g}$ $\Delta$ P

Mid-z fields:

cl1018.8-1211 0.4734 32 32.559 0.264

cl1059.2-1253 0.4564 41 50.193 0.077

cl1301.7-1139 0.4828 34 31.261 0.586

cl1411.1-1148 0.5195 21 13.914 0.841

cl1420.3-1236 0.4962 22 21.594 0.482

High-z fields:

cl1037.9-1243a 0.4252 43 59.027 0.010

cl1138.2-1133 0.4796 45 38.456 0.631

cl1227.9-1138 0.6357 22 14.428 0.782

cl1354.2-1230 0.7620 20 31.260 0.001

Notes - $N_{\rm g}$ is the number of cluster members used in the test ( $N_{\rm g}$ is identical to $N_{\rm mem,~0}$ in Table 5), $\Delta$ is the Dressler-Shectman statistic, and P is the probability of there being no substructure in the dataset; thus, a small value (e.g. less than 0.05) indicates that substructure has been detected. We note that Dressler-Shectman results for 5 additional EDisCS clusters are available in Halliday et al. (2004).

**Table 6:** Results from the Dressler-Shectman test.
Cluster	$z_{\rm cl}$	$N_{\rm g}$	$\Delta$	P
Mid-z fields:
cl1018.8-1211	0.4734	32	32.559	0.264
cl1059.2-1253	0.4564	41	50.193	0.077
cl1301.7-1139	0.4828	34	31.261	0.586
cl1411.1-1148	0.5195	21	13.914	0.841
cl1420.3-1236	0.4962	22	21.594	0.482
High-z fields:
cl1037.9-1243a	0.4252	43	59.027	0.010
cl1138.2-1133	0.4796	45	38.456	0.631
cl1227.9-1138	0.6357	22	14.428	0.782
cl1354.2-1230	0.7620	20	31.260	0.001

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