Left panel: multiplicative detection bias μ_det as a function of the input apparent magnitude when galaxies are placed on a grid (red points) or placed randomly (black points). The blue points show the results for isolated galaxies where the nearest neighbour is more than 5″ away, whereas the light blue points show the detection bias for galaxies with a neighbour within 2″ (blended). Right panel: multiplicative detection bias as a function of observed properties. The classification into isolated and blended galaxies is based on the nearest detected galaxy in this case. The lines connect the points to show the behaviour for the different samples more clearly. The bias for the bright blended galaxies is beyond the axis limits of the chart.