//JPL		p-NH3
//Temp (K)	log(Z)
2.375	0.9875
5.000	1.0328
9.375	1.0641
18.75	1.1694
37.50	1.3922
75.00	1.7029
150.0	2.0809
225.0	2.3218
300.0	2.5010		