Sensitivity analysis of the empirical isochronal shapes in dependence on the parameters Δm, f_Δϖ, f_bin, A_G, and f_field for the representative young cluster delta Sco, with a median distance of ∼142 pc and an estimated age of ∼7.8 Myr (Ratzenböck et al. 2023a). Top row: Boxplots illustrating the effects of the systematically varied factors on the averaged deviation score Δ_iso, avg, analyzed through a full factorial design. Each boxplot represents the deviation scores of all grid points containing the indicated value on the corresponding x-axis tick label. Bottom row: Same as the top row, but this time only showing the evolution of the median Δ_iso, avg at each grid point, along with the 95 % confidence interval estimation. The color coding corresponds to the different Gaia passband combinations. The black lines mark the empirical thresholds determined for each passband, respectively.