Corner plots of χ² surface as a function of the model parameters (Δη, ζ_w) for MAGMA. The violet contours correspond to the minimum χ² value. The top and right panels of each corner plot report the probability density distributions for the marginalized parameters; confidence intervals (±1σ) are shown as violet-tinted shaded rectangular regions, and the MLE (PDF median) is shown by a vertical dashed line. Here, Δη ∈ [0,3.4] (see Fig. 1 for the “symmetric” Δη intervals).