a) All evolutionary tracks in the HR diagram; b) Evolutionary tracks falling in the error boxes from pre-main sequence to main sequence; c) Blow up the evolutionary tracks falling in the error boxes in the main sequence; d) The selected models falling in the error boxes. Error box A (5525 ± 12 K, 0.50 ± 0.006 L_⊙) is denoted by crosses, error box B (5264 ± 100 K, 0.52 ± 0.03 L_⊙) denoted by triangles, and error box C (5264 ± 100 K, 0.488 ± 0.010 L_⊙) denoted by diamonds, respectively.