Bias of mock galaxy catalogues. The faint blue lines represent the measured bias of individual mocks, the thick blue line is the mean of the mocks. Our quoted value for the mean bias (dotted horizontal line) is the mean value between 5.0 <r < 30 h^-1 Mpc which is the scale over which the bias shows the least scale-dependence (dotted vertical lines). The downturn at large scales is caused by the integral constraint.