Table 1.

Dependence of N-NH order parameters on orientation relative to the molecular frame

Average S2 N-NH
All residues	Helix 5 alone	N-NH vectors aligned with those in helix 5 except for those helices 4 and 5
0.773  ± 0.014 (108)	0.854  ± 0.038 (13)	0.764  ± 0.033 (14)

The average order parameters (S²N-NH) were calculated for all internuclear N-NH vectors and for those internuclear vectors aligned (or anti-aligned) within 35° of the helix 5 axis. The number of residues used in each average is given in parentheses. Separate averages are calculated for those aligned N-NH vectors that are contained in helix 5 and those that are not. See text for details.