[F/Fe] and [F/H] versus [Fe/H]. The colored dots represent our sample clusters, and the lines are based on theoretical models. In the left panel, the solid lines are based on the two-infall Spitoni et al. (2019) chemical evolution models, which assume the same fluorine nucleosynthesis prescription as model F7 of Spitoni et al. (2018; see Sect. 4.3. for further details). The right panel shows the models that implement the production of F from both LIMSs and massive stars (solid lines) and the models that implement the production of F from AGB stars only (dashed lines).