Figure 3. Analysis of the X-ray diffraction data in Fig. 2.

The lamellar spacings of the peptide, as well as the l_o and l_d lipid domains are determined from the slopes of q_z vs. n plots. (b) Shows the corresponding electron densities, as determined through Fourier analysis of the out-of-plane diffraction data. The densities for the l_o and l_d lipid domains agree well with densities reported in the literature. The peptide domain shows an almost constant density in the hydrophobic membrane core, indicative of trans-membrane peptides. (c) Membrane orientation is determined from radial integration of the scattered intensity along the meridional degree, φ. The solid line is a fit using a Gaussian profile. By using Hermans orientation function, RBC membranes are 90.9% oriented with respect to the silicon substrate.