Optical color–color diagrams of all sources in the studied field that meet the criteria of good photometry. Figure layout and symbols are the same as in Fig. 5. We show the loci that are expected to be populated by accreting stars with a disk, stars with unreliable infrared excesses, and possible foreground stars. In the IPHAS r − Hα vs. r − i diagram, the solid black lines are ZAMS at increasing extinction, and the dashed lines mark the locus of A stars, as defined by Drew et al. (2005). The solid green line is a ZAMS with EW_Hα = −40 Å and E_B − V = 1 defined by Barentsen et al. (2011).