Outlier rejection. The top two rows show the 8 individual exposures that are used as input. The next four rows show coadds with various statistical measures. The columns of the coadd rows show the result of coadding with different operators (the columns are respectively: no clipping, 3σ-clipping, 4.5 MAD clipping and the method mentioned here). The bottom row (in a box) shows the steps of the newly introduced method only on a single exposure (the one with an outlier).