Void density profiles measured in the f(R) simulations (points), and best fit of the model in Eq. (16) (lines). We split the void catalog into seven subsamples, corresponding to different void sizes, then we stacked all the void density-profiles for each subsample. Here we show the stacked subsamples with mean radius r_0.2 = 3.0 Mpc h⁻¹ (top panel), 5.2 Mpc h⁻¹ (middle panel), and 9.0 Mpc h⁻¹ (bottom panel).