Hertzsprung-Russell diagram: evolutionary tracks of Clés models corresponding to the following best-fit models: Model I (coral), Series II(1) (green), Series II(5) (light blue), Series III(1) (dark blue), and Series IV(1) (plum). The dots and triangles over-plotted on the corresponding tracks correspond to the models for which k_2, 1 is equal to and 0.00139, respectively, while the open circles correspond to the models for which k_2, 1 is equal to . The observational value is represented by the red point, and its error bars are represented by the dark red parallelogram.