Amino acid co-locations vs. charge and size compatibility indexes. Weighted values. Index vs. SeqX 80 values are plotted against the weighted Index SeqX 80 values (i.e. index multiplied by the SeqX 80). This plotting method gave a clear separation of five different kinds of residue co-location (SeqX 80% values) regarding charge (Ch) compatibility (op, opposite; pos, positive; neg, negative; neu, neutral charges (A)) and seven different size compatibility (series 1–7 (C)). The linear regressions are indicated by pink lines. The correlation between the index values and the weighted Index_SeqX 80 values are indicated in (B) and (D). The pink symbols indicate the linear regression lines.