Example of degeneracy: three different stellar structure models with similar period spacing patterns. All three models have the same values for H_slope, metallicity Z, X_s. They differ in their values of mass M, X_c, Ω/Ω_crit, M_μ and curvature α and mode classification (the lower order modes plotted in the period spacing pattern have radial orders n = 14, 15, and 16, respectively, for the red, blue, and green lines). Quantities plotted are the same as Fig. H.1.