Distribution of the three bond angles (8) - (10), according to secondary structures. (Color online) Blue are α-helices, red are β-strands and yellow are loops; the small (yellow) peak in N-Cα-Cβ with angle around 103° is due to prolines. See Table 1 for the average values for α-helices, β-strands and loops in figure a). See also Table 4 for the average values in figures a), b) and c) with no regard to secondary structure. Finally, see Table 2 for the average values.