Accurate p-ρ-T Data for a Synthetic Residual Natural Gas Mixture (0.95 CH4 + 0.04 C2H6 + 0.01 C3H8) at Temperatures between (135 and 500) K at Pressures to 200 MPa Tibaduiza, A.; Cristancho, D.E.; Acosta Ramirez, H.; Ortiz, D.; Holste, J.C.; Hall, K.R.; Journal of Chemical & Engineering Data 2016, 61, 2771-2781