Example of polynomial fits in stellar parameter space to h′₁ and h′₂ from light curve analyses for transit parameters b = 0 and k = 0.1. Red dots with 1σ joint confidence regions depict the results of 3D models of solar metallicity, and blue dots the results for metallicity [Fe/H] = −1. Lines of constant T_eff and log ɡ are added to illustrate the functional dependence. Line segments connect data points and corresponding values predicted by the polynomial.