In lineproducingspecies.tpp, we compute the ortho/para H2 ratio (without any reference to the origin of the formula). The formula apparently originates from the erratum on flower 1984, see https://ui.adsabs.harvard.edu/abs/1985MNRAS.213..991F/abstract . I should put the reference somewhere, that I the next one wondering about the formula origin can easily find an explanation.
In lineproducingspecies.tpp, we compute the ortho/para H2 ratio (without any reference to the origin of the formula). The formula apparently originates from the erratum on flower 1984, see https://ui.adsabs.harvard.edu/abs/1985MNRAS.213..991F/abstract . I should put the reference somewhere, that I the next one wondering about the formula origin can easily find an explanation.