[F/Fe] vs. [Fe/H] observed in Galactic field dwarfs and giants, and open cluster stars compared with the predicted evolution from our GCE model for the solar neighbourhood, including only fluorine production from AGB stars. Black line: yields from Cristallo et al. (2015a); Red line: yields from Karakas (2010). The observed ratios (circles) are from Recio-Blanco et al. (2012; black), Li et al. (2013; blue), Maiorca et al. (2014; green), Jönsson et al. (2014b; cyan) and Nault & Pilachowski (2013; magenta). A typical error bar is shown. See text for details.