Left: Photometric redshift distributions of the photometric LBG samples UNIONSlike_RF in red (the convolution of the UNIONSlike_RF distribution with the DESI spectroscopic efficiency is shown in dashed and dotted lines, they have not been normalized to show the impact at z ∼ 2.5). The distribution of the samples UNIONSlike_RF_u180s, and LSSTY4like_RF_u2x180s are shown in blue and dashed cyan lines. Right: Photometric redshift distributions of the UNIONS LBG samples UNIONS_colorcut and UNIONS_PZcut in the XMM field. The sample selected with the hybrid method à-la SOM is shown for illustration. We also show the quantity nb (the product between the large-scale bias and the normalized redshift distribution) resulting from our clustering-redshift calibration methods.