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Each cluster is very well fitted by the general form predicted for Cold Dark Matter (CDM) dominated halos, with good consistency found between the independent distortion and magnification measurements. The inferred level of mass concentration is surprisingly high, 8<c_{vir}<15 (<c_{vir}> = 10.4 \\pm 0.9), compared to the relatively shallow profiles predicted by the Lambda CDM model, c_{vir}=5.1 \\pm 1.1 (for <M_{vir}> =1.25\\times 10^{15}M_{\\odot}/h). 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