The discriminative power (L
-norm) of discriminant vectors for all possible combinations of Top-1-gram pair (A) and residue pair (B) of protein family 184.108.40.206. The amino acids are identified by their one-letter code. The amino acids labeled by x-axis and y-axis in figure(A) indicate the first Top-1-gram and the second Top-1-gram in Top-1-gram pairs of SVM-DT, respectively; the amino acids labeled by x-axis and y-axis in figure (B) indicate the first residue and the second residue in residue pairs of SVM-DR, respectively. The adjacent color bar shows the mapping of L2-norm values.