The major difference between the Sco X-1 like and Cyg X-2 like sources at the soft apex; upper panel: the blackbody temperature kTBB; lower panel: the corresponding blackbody radii RBB. The dotted lines correspond to the upper and lower limits of the average RBB for the three Cyg-like sources of 11.6 ± 0.6 km at 90% confidence.
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