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Relaxation enhancement, ΔΔω, deduced from Lorentzian linewidths obtained by convolution (ΔΔω = γeΔΔHL) for n-PCSL spin labels in oxygen-saturated dimyristoyl phosphatidylcholine bilayer membranes at 39°C. Solid line is a nonlinear least-squares fit of Eq. 4 to the dependence on spin-label position, n.
