Fig. 13
Distribution of X-ray active stars in the g − r / r − i diagram for two ranges of X-ray luminosities. Black dots Log(Lx) < 29.3. Red crosses Log(Lx) > 29.3. The arrow shows the direction of interstellar reddening. Only sources with photometric errors below 0.1 mag in g − r and r − i are shown. Density contours show the position of all stars identified in the SEGUE programme.
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