For both the POPC and DMPC samples containing crystallized alkane, re-heating of the samples to above the n-alkane melting temperature leads to a recovery of the initial 2 H spectrum within the first few scans after temperature equilibration. This observation suggests that C30 crystals are small and most likely located inside the lipid bilayers. Only then, the n-alkane molecules are able to quickly disperse throughout the membrane upon melting.