Fig. 4

Representative colour–colour plots for the AGN training sample. Full magenta triangles represent objects brighter than 19 mag in the i′ band. Open black triangles – AGNs with i-apparent magnitude between 19 and 20 mag; open green circles – AGNs with i′ magnitude between 20 and 21 mag; objects with i′ apparent magnitude between , and
mag are marked as open blue squares and open red diamonds, respectively; AGNs with i′ apparent magnitude fainter than 22.5 are marked as open rotated cyan triangles.
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