Solar twin YPB1194 of open cluster M 67 observed by Pasquini et al. (2008): Li destruction along the evolutionary tracks as a function of effective temperature. The shaded zone represents the range of masses of TGEC models limited by the observational error bars. A model (dot-dashed lines) of 1.000 M_⊙ passes through the observed point. The position of the Sun and the lithium destruction of a solar model (dotted line) are indicated. The Li abundance of the solar twin is an upper limit (triangle).