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Table 1 Distances in α-helices. Core: distances not involving residues at helix edge. Termini: distances involving at least one residue at helix edge. Mean distances, computed on the HRes set, are indicated in Å with their standard deviations within parentheses.

From: Protein secondary structure assignment revisited: a detailed analysis of different assignment methods

Type Core Termini
i to i + 2 5.49(0.20) 5.54(0.25)
i to i + 3 5.30(0.64) 5.36(0.39)
i to i + 4 6.33(0.71)
i to i + 5 8.72(0.63)