Uncertainties, expressed in percent, of star cluster structural parameters versus cluster core radius, r_c. Left column – the median of uncertainties arising due to stochastic IMF sampling and the spatial distribution of cluster stars, δ_GEN; right column – due to cluster projection effects, δ_ROT. Top row – the median of uncertainties of R₅₀; middle row – R₃₀/R₅₀; bottom row – R₅₀/R₈₀. Results are shown for clusters with log(M/M_⊙) = 3.0 and log(t/yr) = 8.0, and three γ values (see legend). Structural parameters are measured using FGCs in the F475W passband. Blue and red markers and corresponding lines are slightly shifted along the X-axis around the original input value for visual clarity. Square root scaling is applied for the X-axis.