Estimated values for C2H2 from the polynomial in:
Fray, N., and B. Schmitt 2009.  Sublimation of ices of astrophysical
interest: A bibliographic review.  Planet. Space Sci. 57, 2053-2080.
 T(K)     P(bar)
 55.00   6.23e-15
 56.00   1.42e-14
 57.00   3.14e-14
 58.00   6.77e-14
 59.00   1.42e-13
 60.00   2.91e-13
 61.00   5.81e-13
 62.00   1.14e-12
 63.00   2.18e-12
 64.00   4.08e-12
 65.00   7.51e-12
 66.00   1.36e-11
 67.00   2.41e-11
 68.00   4.20e-11
 69.00   7.21e-11
 70.00   1.22e-10
 71.00   2.03e-10
 72.00   3.33e-10
 73.00   5.40e-10
 74.00   8.63e-10
 75.00   1.36e-09
 76.00   2.13e-09
 77.00   3.28e-09
 78.00   5.01e-09
 79.00   7.55e-09
 80.00   1.13e-08
 81.00   1.67e-08
 82.00   2.44e-08
 83.00   3.55e-08
 84.00   5.10e-08
 85.00   7.28e-08
 86.00   1.03e-07
 87.00   1.45e-07
 88.00   2.01e-07
 89.00   2.78e-07
 90.00   3.82e-07
 91.00   5.21e-07
 92.00   7.05e-07
 93.00   9.48e-07
 94.00   1.27e-06
 95.00   1.68e-06
 96.00   2.22e-06
 97.00   2.92e-06
 98.00   3.81e-06
 99.00   4.95e-06
100.00   6.39e-06
101.00   8.22e-06
102.00   1.05e-05
103.00   1.34e-05
104.00   1.70e-05
105.00   2.14e-05
106.00   2.69e-05
107.00   3.36e-05
108.00   4.18e-05
109.00   5.19e-05
110.00   6.41e-05
111.00   7.89e-05
112.00   9.68e-05
113.00   1.18e-04
114.00   1.44e-04
115.00   1.75e-04
116.00   2.11e-04
117.00   2.55e-04
118.00   3.06e-04
119.00   3.67e-04
120.00   4.38e-04
121.00   5.22e-04
122.00   6.19e-04
123.00   7.33e-04
124.00   8.66e-04
125.00   1.02e-03
126.00   1.20e-03
127.00   1.40e-03
128.00   1.64e-03
129.00   1.91e-03
130.00   2.23e-03
131.00   2.58e-03
132.00   2.99e-03
133.00   3.46e-03
