VST r − Hα vs. r − i diagram plotted as a two-dimensional stellar-density histogram using a binning of 0.005 × 0.005 and an eight-level color-coded scale such that high source densities (130 per bin) are dark green and the lowest densities (one per bin) are violet. The magenta solid and dashed lines are the synthetic unreddened main sequence and giant loci, respectively, given by Drew et al. (2014), and the black solid line is the limit adopted to select objects with Hα excesses, drawn as magenta circles.
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