Representative colour–colour plot for all objects used for a consistency check for VIPERS objects with redshift confirmation levels >99%, with i′ apparent magnitude between 19 and 22.5. Pink x-s represents galaxies with VIPERS_Zflag = 3. Open blue circles correspond to AGN sample with redshift confirmation level equal to or higher than 99% (VIPERS_Zflag equal to 13 and 14). Open black squares correspond to stellar sample with VIPERS_Zflag equal to 3 and 4.