(u − g) vs. (g − r) colour–colour diagram for VUDS galaxies with 2.5 < z < 3.5. Galaxies with flags 3 and 4 are represented by red squares, galaxies with flag 2 by orange triangles while type I AGN are represented by filled magenta circles. The ugr selection would have selected 80% of the VUDS galaxies with 2.5 < z < 3.5, but with a high level of contamination because 40% of galaxies in the selection area of the ugr are outside the redshift range 2.5 < z < 3.5.
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