Number densities for different BH seeds by comoving megaparsec. The orange circles are the case for seeding all pristine halos at redshift above ≳ 13. The diamond shaped markers correspond to the DCBH scenario assuming the minimum Lyman-Werner radiation scenario, in white are Habouzit et al. (2016) and on gray Dijkstra et al. (2014), the squares are the maximal Lyman-Werner threshold form Dijkstra et al. (2014), the white stars are the semi-analytical calculation of NSC BH seed from Devecchi et al. (2012) assuming an average mass of 700 M_⊙.