(color online) Simulation data used in this work, (i) SG-PI (nuclei path integral Monte Carlo with the empirical Silvera-Goldman intermolecular potential), (ii) DFT-PI (nuclei path integral molecular dynamics with ab initio DFT inter-ionic potential), (iii) DFT-MD (classical nuclei molecular dynamics with ab initio DFT inter-ionic potential), (iv) PIMC (nuclei + electron path integral quantum Monte Carlo; not used for fitting in this work, only for validation), (v)
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