X: Unconstrained or undetermined, a: Bias factors converted to a common cosmology (, , ), b: DMH masses estimated using van den Bosch [54] and Sheth et al. [55], 1: Ebrero et al. [42], fit , assuming no redshift evolution of the correlation length, 2: Gilli et al. [33], 3: Basilakos et al. [30], using the LDDE model, 4: Yang et al. [34], 5: Miyaji et al. [41], fit with integral constrain, assuming redshift evolution of the correlation length, 6: Gilli et al. [44], 7: Allevato et al. [45].