Observed and predicted [F/Fe] vs. [Fe/H] for the Galactic halo for our reference chemical evolution model for variable rotational velocity as in Rizzuti et al. (2025a) (left) and for non-rotating massive stars (right). The data are taken from Mura-Guzmán et al. (2025) (blue) and Lucatello et al. (2011) (green), both upper limits and measurements with corresponding error bars; smaller dots correspond to CEMP-s stars. We also show Carina data from Abia et al. (2015) (magenta).