C2H6 data from Regnier (1972).
 T(K)     P(bar)
89.50    1.06e-05
88.95    8.80e-06
88.25    6.89e-06
87.25    4.83e-06
86.15    3.27e-06
84.70    1.91e-06
84.30    1.65e-06
83.30    1.11e-06
82.55    8.13e-07
81.70    5.73e-07
80.80    4.00e-07
