Apparent optical V/V − I CMD for the variable candidates. The dashed curve shows the isochrones for PMS stars with different ages from Siess et al. (2000), while the solid curve is the ZAMS by Girardi et al. (2002). The dotted curves display the evolutionary tracks of PMS stars with different stellar masses. The isochrones and the evolutionary tracks are offset with respect to the average distance (857.5 pc) and extinction (A_V = 1.9 mag). The color bar represents the 2MASS (H − K) color. Open triangles represent the kinematic outliers. The arrow indicates the direction of the reddening vector corresponding to A_V = 5 mag.