Median magnitudes of our simulated sources in the Euclid, Rubin, and Spitzer filters. Light brown circles represent stable intermediate-z galaxies, red stars z > 6 contaminants, and blue diamonds true z > 6 galaxies. For each population, the dotted lines indicate the 16th and 84th percentiles. For each band, the 2σ flux limit is shown with a green bar. The selection of intermediate-z, contaminants, and z > 6 galaxies is based on Euclid+Rubin+Spitzer data. The median magnitudes for z > 6 galaxies in the Rubin u, g, r bands are equal to −99 (no intrinsic flux) and therefore omitted from this figure.