(a) Tail angle distributions of the vesicles with various C₆₀ concentrations (annotated at top) under diverse vertical pressures (annotated on the right). (b) Relation between the average of tail angles in the membrane and the C₆₀ concentration under different pressures, presented separately for the bilayer and each monolayer. Symbols are the measured data from our simulations, and solid lines indicate the results of linear fitting to each set of data.