All other chemicals were obtained in pro analysis quality from Lactan (Graz, Austria). The data were obtained at the EMBL BioSAXS beamline (Hamburg) using 20 keV photons at T = 300 K and analyzed in terms of the SDP-GAP model described in Refs. The data from MLVs contain the structure factor (the crystalline lattice) and form factor in a convoluted fashion, yet by tting the scattered intensity data we obtained both contributions. The electron density proles were modelled from form factors using the SDP model, where volume distribution functions are described by individual Gaussians or error functions.