particles { particle: particle_type=Argon, element_name=Ar, sigma=1.000000e+00, epsilon=1.000000e+00, sigma14=1.000000e+00, epsilon14=1.000000e+00, mass=1.000000e+00, free=3, charge=0.000000e+00; }; nonbonded_2body_potentials { ljspline: particle_type1=Argon, particle_type2=Argon, r_cut=2.300000e+00, r_l=1.900000e+00; };