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Table 2 C-caps of alpha helices: position of the first residue with φ > 0. The letter under the position number corresponds to the assignment of the residue relatively to the helix concerned. Thus the position -1 is the last helical residue and should correspond to the C-cap, while the position 0 must correspond to the first residue with a positive φ.

From: Secondary structure assignment that accurately reflects physical and evolutionary characteristics

Position of the φ > 0 residue -3 H -2 H -1 H 0 C 1 C 2 C 3 C
Segno 0 (0%) 0 (0%) 0 (0%) 2458 (81%) 277 (9,1%) 182 (6%) 119 (3,9%)
Stride 3 (0,1%) 0 (0%) 1 (0%) 2335 (84,8%) 183 (6,6%) 124 (4,5%) 107 (3,9%)
DSSP 13 (0.4%) 14 (0.5%) 30 (1%) 1911 (63,9%) 709 (23.7%) 193 (6,5%) 119 (4%)