As neither reflections resulting from superstructures nor from helix peaks could be observed for the reconstituted peptide species 3-6, quantitative images (accumulations) of the q space were taken, focusing on the lipid chain correlation peak (cc peak). In analyzing the lateral lipid bilayer response of different samples upon peptide insertion, the cc peak gives indirect information on the peptide reconstitution and peptide/lipid interactions. Attenuation of the specular axis at low angles of incidence, e.g., a i & 0.4°, avoiding overexposure of the detector provided sufficient access to the cc peak at low q z (Fig. 4a) . Taking images of the reciprocal space at higher a i (e.g., a i & 2.5°) without attenuation led to unacceptably high sample horizons (shadowed low q z ) that were not applicable for analysis of the cc peak.