Injection test summary figure. Top panel: Comparison between the mock spectrum (black) and the fitted GP-aided model (red). Top subpanel: Corner plot of the grid parameters from the inversions with (red) and without (blue) GP. Green lines indicate the injected values. Bottom panel: Normalized residuals between the mock data and the fitted GP-aided model (black). Shaded regions represent the 1σ, 2σ, and 3σ dispersions from 200 random draws from the covariance matrix C.