Post-MS evolutionary tracks used in this work (Georgy et al. 2013), with overplotted IS boundaries of radial fundamental pulsation determined for the different assumed initial rotation rates. The number at the beginning of each track indicates initial mass in solar units. Assumed initial rotation rates are color-coded; red lines are for models without rotation (ω_ini = 0), black lines for models with an initial rotation of 50% critical rate (ω_ini = 0.5), and blue lines for an initial rotation of 90% critical rate. IS boundaries shown as dash-dotted lines indicate first crossing models, dashed lines the second crossing, and solid lines the third crossing.