Secondary positron flux predictions using the best-fit transport parameters of the BIG (left panel), SLIM (middle panel), and QUAINT (right panel) propagation models, as inferred from the AMS-02 combined Li/C, Be/B, and B/C analysis. The three lines correspond to TOA fluxes, modulated at 650 MV, for the best-fit (solid line) and 1σ upper (dash-dotted) and lower (dashed) limits on L (see Table 3) – AMS-02 data are from Aguilar et al. (2019a).