Comparison of the coefficients a (upper left panel), b (upper right panel), and c (lower left panel) and the root mean square s_ε (lower right panel) of the fundamental plane for all models and wavelengths. There are two additional data points for the p model, because we included the refitted coefficients after a cut in log ₁₀(R₀) to remove wrong data points caused by problems discussed earlier in this paper. In general, the behaviour of the coefficients is similar for all models and only depends on the wavelength (notable exception the z band of the p model).