Redshift distributions for the five tomographic redshift bins used in the KiDS-1000 cosmological analyses estimated with the SOM method of Wright et al. (2019). The grey vertical bands indicate the photo-z cuts defining the bins. Solid red lines show the estimate from the KiDS-1000 data whereas the dotted blue lines and their confidence intervals represent the average and standard deviation of all lines-of-sight of the MICE mocks. The dashed orange lines show one representative (in terms of its mean redshifts) line-of-sight (number 39 in our list) that is used in Sect. 4.2.