Difference between different methods used to stop the summation (upper cuts) of the partition function. Different cut-offs are compared to the partition function obtained from case 8 (see text for more details), which is the zero line. The curve marked “experimental” data is derived by summing the Boltzmann factor of experimental data for the ground state used in Kurucz (priv. comm.)3. The blue curve is is the summation for the ground electronic state summed to D0 only. The red curve is the corresponding summation of energy levels of the three lowest electronic states based on Dunham coefficients and with a cut-off according to Eqs. (38) and (39).
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