IPHAS (r−Hα,r−i) diagram. The grayscale background is a 2D histogram of all IPHAS objects in the sky region of Fig. 1, with bin sizes of 0.01 in both axes. The dashed line is the CTTS-star limit. Symbols as in Fig. 7, with the addition of YSOs from RGS11 (violet squares), and emission-line stars from H58 (dark-green squares). Hundreds of faint stars above the dashed line are not selected here as Hα-emission stars because of their position in the CMD.
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