As Fig. 3 but only for the (p)WVir. For reference, the fundamental mode (solid line) and first overtone (dashed line) blue (for Z = 0.004) and red edge (for Z = 0.008) of the IS of classical Cepheids are indicated Bono et al. (2000). Tracks from the BaSTI database (Pietrinferni et al. 2004) are plotted in light blue (Z = 0.001), magnenta (Z = 0.002), yellow (Z = 0.004), and brown (Z = 0.008) for stars with initial masses of 2.5 M_⊙ (2 models, bluest extension between log L = 2.2–2.4), 3.0 M_⊙ (3 models, bluest extension between log L = 2.35–2.8), and 4.0 M_⊙ (2 models, bluest extension between log L = 3.0–3.2). A point is plotted for every 1 Myr of evolution. The dark blue track represents the evolutionary track (Miller Bertolami, priv. comm.) of a star with 0.60 M_⊙ at the ZAHB that evolved through the AGB and experiences a TP, which results in the star crossing the IS. The evolution in that region is very fast. Each points represents 10 yr of evolution.