Primary fraction of ¹⁹F as a function of rigidity for the propagation configuration SLIM and the three production cross-section sets OPT12 (dashed light-grey lines), OPT12up22 (solid black lines), and OPT22 (dash-dotted grey lines). The thick lines have been calculated from the best-fit source parameter q_¹⁹F of the combined analysis of F/Si and (Li,Be,B)/C (see filled symbols in Fig. 3). The thin lines with downward arrows show the 1σ upper limits in the same configuration. For comparison, the purple dotted line shows the total relative uncertainties (errors combined quadratically) of the AMS-02 F/Si ratio (see text for discussion).