Values for C2H4 from our polynomial fit to the data.
 T(K)     P(bar)
 55.00   1.22e-12
 56.00   2.69e-12
 57.00   5.74e-12
 58.00   1.19e-11
 59.00   2.43e-11
 60.00   4.81e-11
 61.00   9.31e-11
 62.00   1.77e-10
 63.00   3.28e-10
 64.00   5.98e-10
 65.00   1.07e-09
 66.00   1.88e-09
 67.00   3.25e-09
 68.00   5.51e-09
 69.00   9.23e-09
 70.00   1.52e-08
 71.00   2.47e-08
 72.00   3.96e-08
 73.00   6.26e-08
 74.00   9.78e-08
 75.00   1.51e-07
 76.00   2.30e-07
 77.00   3.47e-07
 78.00   5.18e-07
 79.00   7.65e-07
 80.00   1.12e-06
 81.00   1.62e-06
 82.00   2.32e-06
 83.00   3.30e-06
 84.00   4.65e-06
 85.00   6.50e-06
 86.00   9.02e-06
 87.00   1.24e-05
 88.00   1.69e-05
 89.00   2.30e-05
 90.00   3.09e-05
 91.00   4.13e-05
 92.00   5.48e-05
 93.00   7.23e-05
 94.00   9.48e-05
 95.00   1.24e-04
 96.00   1.60e-04
 97.00   2.06e-04
 98.00   2.64e-04
 99.00   3.36e-04
100.00   4.26e-04
101.00   5.37e-04
102.00   6.73e-04
103.00   8.41e-04
104.00   1.04e-03
