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The average lengths, 
(evaluated as 
) of relevant P-H vectors and their angles with respect to the bilayer normal,
| Vector |
 (Å) |
 (deg) |
|---|---|---|
| P-HA | 2.92 | 43.3 |
| P-HB | 2.96 | 39.3 |
| P-H11A | 2.99 | 88.9 |
| P-H11B | 2.97 | 89.2 |
The P-H vector is pointing toward the center of the bilayer when 
= 0. Standard errors are 0.001–0.002 Å for 
and 0.3° for 
