Model predictions for the chemical evolution of Ce in the [Ce/Fe] vs. [M/H] plane (high-quality sample). The blue line stands for the model assuming the same parameter as in Spitoni et al. (2023, see their Table 2). In this case, the timescale of the gas accretion for the high-α sequence is τ₁ = 0.1 Gyr. The red line shows the case with τ₁ = 0.8 Gyr. The grey line represents the model where the yields of Limongi & Chieffi (2018) for rotating massive stars assuming that all stars rotate with an initial velocity of 300 km s⁻¹ have been considered. GSP-Spec stars with guiding radii R_g between 8.1 and 8.4 kpc are indicated with grey points. The contour lines enclose fractions of 0.95, 0.90, 0.75, 0.60, 0.45, 0.30, 0.20, and 0.05 of the total number of observed stars.