Similar to Fig. 1, but for the models with different masses and constant diffusive mixing coefficients of D_mix to 10¹¹ cm² s⁻¹, 10¹² cm² s⁻¹, 10¹³ cm² s⁻¹, and 10¹⁵ cm² s⁻¹. Different values are displayed in the upper left corner of each subgraph. The solid and dashed lines show the evolutional tracks at Stages I and II, respectively. The red and blue circles are the Li-rich giant stars and the RC stars listed in Table 1, respectively. The star represents the most Li-rich giant star, TYC 429-2097-1, observed by Yan et al. (2018).