Color–magnitude diagram of the solar analog sample of M 67 from Yadav et al. (2008). The dot-dashed isochrone, the continuous isochrone and the dashed isochrone correspond to an age of 3.21 Gyr, 3.87 Gyr, and 4.42 Gyr, respectively. The three best solar twins, YPB637, YPB1194, and YPB1787, are represented respectively as square, diamond, and triangle. The other solar analogs from Pasquini et al. (2008) are represented with open circles.