Galaxy bias b of E/S0 (red symbols) and S/SB (blue symbols) galaxies with as a function of redshift. The dots are from this work by cosmic variance analysis, b_v. The crosses are from Hurtado-Gil et al. (2015) by two-point correlation function analysis, b_ξ. The dashed lines and the coloured areas mark the error-weighted average of b_v and its error, respectively, for red () and blue () galaxies. The dotted line marks unity. A colour version of this plot is available in the electronic edition.