2H2-16O__Hewitt.pf is the partition function for the (2H)2(16O) isotopologue of
the water molecule across the temperature range 1 - 1000 K. Data are given in
two columns, T /K and Q(D2O), the internal partition function including the
nuclear spin degeneracy factor of each nuclear spin isomer (gns = 6, 3 for
ortho-D2O, para-D2O respectively). These data were published using the
astronomers' convention (including a factor of 1/3 or 2/3 for para- and
ortho-D2O respectively as Table 1 of Ref [1].

[1] A. J. Hewitt, N. Doss, N. F. Zobov, O. L. Polyansky, J. Tennyson,
"Deuterated water: partition functions and equilibrium constants", Mon. Not.
R. Astron. Soc. 356, 1123-1126 (2005)