Comparison between the M_UV (top) and z_phot (bottom) derived with and without Euclid photometry. The sample here is based on sources which are present in both the U-only and U+E samples. In the top panel, the large black points indicate sources that have their M_UV change enough after the inclusion of Euclid photometry that they move into a different LF M_UV bin. In both panels, the dashed line shows the one-to-one relation.