the data, as well as new standards of rigor. It calls for establishing a satisfactory protocol for analyzing the data on a relatively simple and homogeneous data sample.

This article represents an important pillar in our CR data analysis based on the overall philosophy sketched above. As long established [@Owens1976a; @GinzburgEtAl1980; @ProtheroeEtAl1981; @StrongEtAl1998; @MaurinEtAl2001], a flux ratio of elements present but in traces in the solar system material and interstellar medium (ISM), such as Lithium, Beryllium, Boron (“secondaries”), to abundant species like Carbon or Oxygen (“primaries”) is extremely sensitive to propagation parameters. It was shown to be also almost insensitive to the energy spectrum of the injected primary species, notably if those are described by a common power-law in rigidity [@MaurinEtAl2002a; @PutzeEtAl2011; @GenoliniEtAl2015], a rather generic prediction of studies of CR acceleration at sources [@MalkovEtAl2001; @CaprioliEtAl2014; @Amato2014a; @MarcowithEtAl2016]. In particular, at high rigidities we expect the B/C ratio (currently the most precisely measured) to be dominantly affected by diffusive propagation and nuclear cross sections.

In [@GenoliniEtAl2017], we performed an analysis of the high-rigidity range of the AMS-02 B/C ratio [@AguilarEtAl2016a], finding evidence for a diffusive origin of the observed spectral break, at the same rigidity scale inferred from a similar 