Multiplicative bias as a function of n_fac, the relative increase in galaxy number density with respect to the baseline simulation. The grid-based results correspond to n_fac = 0. The black points show how the detection bias increases with n_fac. The red (blue) points correspond to the METACALIBRATION (METADETECTION) results discussed in Sect. 5 (Sect. 6). The light coloured points show the biases for relatively isolated galaxies (distance to nearest galaxy in the input catalogue larger than 2″).