Accurate P-ρ-T Data and Phase Boundary Determination for a Synthetic Residual Natural Gas Mixture Cristancho, D.E.; Mantilla, I.D.; Coy, L.A.; Tibaduiza, A.; Ortiz-Vega, D.O.; Hall, K.R.; Iglesias-Silva, G.A.; Journal of Chemical & Engineering Data 2011, 56, 826-832