Similar to Fig. 2, but for 10 000 simulations with random active regions. However, unlike Fig. 2, here, we present the relative planet radius variation in with a percent. The density indicates for each line how many of the other lines share every point within the range of ΔR_p ∕R_⋆ ≤ 0.0005. Instead of the actual lines, the region of uncertainty for each transmission spectrum is plotted.