Filling factor test function of clusters F_C(δ₀) and voids F_V(δ₀). Solid lines show test functions of L512 models for four smoothing scales, R_B = 1,  2,  4,  8 h⁻¹ Mpc. Left panels are for cluster filling factors, right panels for void filling factors. Upper panels: filling factors of SDSS samples, while lower panels show filling factors of HR4 samples, both according to the symbols in the respective keys.