Cross-correlation function between the “PrimB” sample and the groups and clusters with masses above 10¹³ h⁻¹ M_⊙ (gray dashed line). The green dot-dashed line corresponds to the cross-correlation that uses random positions of massive halos with a vector of 5 h⁻¹ Mpc length from the original positions. The sub-panel shows the ratio between the correlation functions using the original and random positions of massive halos. They are the same at scales larger than 10 h⁻¹ Mpc.