Fig 1. Success rates of 3dRPC-Score over the training set for different values of the constant lnP_v in Eq (2).

P_v is the probability of class C in the whole conformational space of nucleotide-residue pairs in ideal state. Since the nucleotide-residue pairs are clustered into 10 classes, P_v = 1/10 or ln(P_v) ≈ -2.3 and so the success rate has a dramatic change between -2 and -3.