Marginalised 1σ confidence values for galaxy bias parameters, with an Euclid-like survey alone (plain lines) or in combination with the CMB-S4 lensing survey (dashed lines). We marginalised the five free parameters of the ΛCDM model. We show constraints with angular galaxy clustering (blue and brown lines) and in combination with ARF (green and red lines). The mean redshift of each shell is shown at the top. We see that the ARF combined with angular galaxy clustering D_g,  z provides better constraints on galaxy bias than the combination of angular galaxy clustering with CMB lensing D_{g,  κCMB}.