sistent with a transition at X$_{c}$ = 0 . 031 V$_{g}$ . (A) Entropy s versus X . (B) Volume fraction φ$_{j}$ versus X . (C) Free energy density f versus X . We extend f for both branches to indi- cate the possible metastable states. At X$_{c}$ the system follows the minimization of the free energy signaling the transition from RCP to order. (D) Free energy functional F ( q$_{6}$ ) versus q$_{6}$ (vertical axis) φ$_{j}$ (horizontal axis). Color bar indicates the values of F ( q$_{6}$ ), which are plotted in the range indicated to focus on the region of coexistence. The minima correspond to the disordered phase and the FCC and HCP phases in the ordered branch. 

