ΔΠ range for models computed with a different mixing prescription, ¹²C(α, γ)¹⁶O nuclear reaction rates, and metallicities. Models with metallicities of −0.5, 0, and 0.2 dex are shown in shades of blue, orange, and green, respectively. The opacity of the bar scales with the time that the model spends at that given period spacing. The observations from Vrard et al. (2016) are shown in purple, and the opacity is related to the number of stars observed at that value of ΔΠ. The models with semiconvection, overmixing, and penetrative convection were computed with the CPM scheme.