RMSE of the MAP estimates for all synthetic test models (black), M-type test models (blue, 2600 K ≤ T_eff ≤ 4000 K), K-type test models (orange, 4000 K < T_eff ≤ 5250 K), and G-type test models (green, 5250 K < T_eff ≤ 6000 K) at 11 different relative flux errors. The grey horizontal dashed line and shaded area represent the median (1.12%) and standard deviation (0.77 dex) of the relative flux error (σ_med) of Tr14 samples in the Clean group.