Mean and scatter of the shift parameters obtained from the 100 MICE2 realisations with noise adaptation. The blue line and shaded area indicate the bias in the median SOM redshift, the green and red data points indicate the mean and scatter of the shift-fit parameters D_z when fitting the realisations with either the true or SOM redshift distribution. The black data points represent the difference between the empirical SOM bias estimate and the shift-fit parameter.