Manual of Petroleum Measurement Standards Chapter 11.2.2 - Compressibility Factors for Hydrocarbons: 0.350-0.637 Relative Density (60 Degrees F/60 Degrees F) and -50 Degrees F to 140 Degrees F Metering Temperature [GPA 8286-86] Chapter 11.2.2M - Compressibility Factors for Hydrocarbons: 350-637 Kilograms per Cubic Metre Density (15 Degrees C) and -46 Degrees C to 60 Degrees C Metering Temperature