TABLE 1.

Angular amplitude (β), asymmetry in ordering (S_xx-S_yy), and rotational correlation time (τ_R) for spin-labeled phosphatidylcholines, n-PCSL, in dimyristoyl phosphatidylcholine bilayer membranes at 39°C, obtained from simulation of linear V₁-EPR spectra assuming rapid angular rotation

Spin label	β (°)	Sxx-Syy*	τR (ns)
4-PCSL	53	−0.08	1.8
5-PCSL	54	−0.17	1.8
6-PCSL	57	−0.14	1.7
7-PCSL	59.5	−0.02	1.6
8-PCSL	61	0.00	1.4
9-PCSL	69	+0.25	1.5
10-PCSL	76	+0.03	1.4
11-PCSL	77	−0.14	1.3
12-PCSL	80	−0.38	1.2
13-PCSL	82.5	−0.35	0.83
14-PCSL	84	−0.35	0.77
16-PCSL	90	−0.2	0.62

^*Diagonal elements of the ordering tensor are related by S_xx + S_yy = −S_zz, where S_zz = (1/2)cosβ(1 + cosβ).