It should be noted that model dependence is also problematic in the reduction of data from experimental spectroscopy. Different models produce different values of meaningful parameters, and analytical functions may fail to reproduce experimental data, despite their great proliferation known as "potentiology." Polyatomic potential-energy functions have a separate literature for smoothing functions, as a result of their greater dimensionality. Here we only note that the polyatomic strategy by Fu et al. is most closely related to the present suggestion.