//JPL		o-NH3-hfs
//Temp (K)	log(Z)
2.291	1.0792
5.000	1.0845
9.375	1.1439
18.75	1.3260
37.50	1.6342
75.00	2.0521
150.0	2.4940
225.0	2.7562
300.0	2.9460
500.0	3.3010
1000.0	3.8259		