Left panel: galaxy bias as a function of redshift. Dots correspond to the measured values in the Flagship simulation for different magnitude cuts and the solid lines are a fit following Eq. (11). We plot with squares the bias values obtained for z = 2 to indicate that at that redshift there are few objects and thus the values are slightly less reliable. At m_VIS < 23 there were not enough objects at z = 2 to compute the bias in Flagship. Right panel: ratio between the HSC bias, b_HSC, from N20 and the Flagship bias for each magnitude-limited sample. To assess the 1σ uncertainty of b_HSC along the redshift range, we generate a set of Gaussian random numbers for the free parameter α, b₁, and b₀ of b_HSC with their values as mean and their errors as standard deviation. Then we evaluate b_HSC in the redshift range for all the set of free parameters previously generated. We pick the maximum and minimum b_HSC at each redshift. This corresponds to the shaded regions.