../../td/EquilibriumCrystalStructure__TD_457028483760_001/runner Sn A_tI2_139_a a c/a standard 2 4.0868 0.85281883 3.4699 1.4037869 MEAM_LAMMPS_VellaChenStillinger_2017_Sn__MO_316045643888_002