As Fig. 6 but showing for the 0.8 M_⊙ standard BaSTI track (solid line in both panels), the effect of changing the He-core mass at the He-flash by ±0.02 M_⊙ (dashed lines in the left panel), the amount of He dredged to the surface by the first dredge up by δY_FDU = ± 0.02 (dash-dotted lines in the left panel), the reaction rate (doubled and halved, respectively; dotted lines in the left panel), the mixing length α_MLT by −0.15 (dashed line in the right panel), the Rosseland mean opacities by ±5% (dotted lines in the right panel), and the reaction rate from the Angulo et al. (1999) to the Formicola et al. (2004) tabulations (dash-dotted line in the right panel).