As a general trend upon reconstitution of the different peptide species, we observed a significant decrease in the acyl chain distance a while the values for the lipid chain correlation length n increased (Fig. 5b) . One may initially expect the opposite effect, i.e., an increase in a and a decrease in n. This could appear conclusive, since the occupation of the lipid bilayer area by peptide inclusions would lead to additional and longer trans-helix chain-chain distances for so-called annular lipids, which are in direct contact with the peptide helix. Furthermore, the absent chain-chain correlation between those lipids could reduce n. From the experimental results it is obvious that this is not the case, or at least other phenomena are outweighing such assumed effects leading to an increase in lipid packing (density) and chain ordering.