The Lennard-Jones substance form fcc (face centered cubic), hcp (hexagonal close-packed) and other close-packed polytype lattices – depending on temperature and pressure, cf. figure above with phase diagram. At low temperature and up to moderate pressure, the hcp lattice is energetically favored and therefore the equilibrium structure. The fcc lattice structure is energetically favored at both high temperature and high pressure and therefore overall the equilibrium structure in a wider state range. The coexistence line between the fcc and hcp phase starts at T = 0 at approximately p = 878.5 ε ε σ σ − − 3 , passes through a temperature maximum at approximately T = 0.4 ε ε k B − − 1 , and then ends on the vapor–solid phase boundary at approximately T = 0.32 ε ε k B − − 1 , which thereby forms a triple point. Hence, only the fcc solid phase exhibits phase equilibria with the liquid and supercritical phase, cf. figure above with phase diagram.