Atomistic studies on phase-separating DPPC:DOPC:CHOL ternary mixtures have shown a peculiar organization of cholesterol, with the cholesterol methyl-protruding face maximizing contacts with DOPC, while the smooth cholesterol face maximizing DPPC contacts 125 . At lower temperatures (~270-280 K), these segregate to the boundaries of the two phases. We do not see evidence of this complex organization in any of our Martini 3 or 2 phase-separating systems. However, with Martini 3, much like with the DPPC:CHOL binary mixtures, some highly ordered gel-like substructures were observed within the DPPC-rich Lo phases, in line with experimental and AA findings . No such substructures are observed with Martini 2.