the AMS-02 B/C data taking period. Based on [@GhelfiEtAl2016], we set $\phi_{\rm F}$ as a nuisance parameter of mean value 730 GV and dispersion $\sigma_{\phi_{\rm F}}=$100 MV.

### Data errors

The AMS-02 collaboration does not provide users with the covariance error matrix of the data. In this case, it is common practice to estimate the *total* errors by summing systematics and statistics in quadrature. This procedure is however inappropriate when systematics dominate, i.e. below $\sim$ 100 GV for the AMS-02 data, and for which correlations in energy are expected to be important. A major novelty of the present analysis is to perform fits taking into account these correlations with a parametric form of the covariance matrix. The matrix was built thanks to the information provided in the Supplemental Material of the AMS-02 B/C analysis [@AguilarEtAl2018]. In particular, the different systematics, which are associated with different physics processes in the detector, have different correlation lengths, and the covariance matrix built reflects this complexity. For more precision we refer the reader to [@DeromeEtAl2019].

### C and O primaries

It has been noted already that recent data show an indication for a high-rigidity break in the diffusion coefficient. However, these data are at 