constrained from Ref. [@GhelfiEtAl2016] for the AMS-02 data taking period.

### Geometry and cross sections {#sssec:geom}

We assume a 1D propagation model, as introduced in  [@BulanovEtAl1974; @Ptuskin1974; @Jones1979; @PtuskinEtAl1990; @JonesEtAl2001; @MaurinEtAl2001], where the magnetic halo confining the CRs is an infinite slab in the radial direction and of half-height $L$. Indeed, the radial boundary has only a minor quantitative impact on other transport parameters when the diffusion coefficient is taken as a scalar function (see  [@MaurinEtAl2002a; @PutzeEtAl2010]), and neglecting the radial dependence allows us to more efficiently probe the entire available parameter space without significant loss of generality. Therefore, we consider the vertical coordinate $z$ to be the only relevant spatial coordinate. See however for some considerations on the correspondence between 1D and 2D models.

The sources of CRs and the ISM gas which they scatter off are taken homogeneous in an infinitely thin disk at $z=0$, with an effective half-height $h=100$ pc. Energy losses are also considered to be localized in the disk, $b_{\rm tot}\propto 2\,h\,\delta(z)$. The ISM density is set to $n_{\rm ism}=2\,h\delta(z)\,n_0$, where $n_0=1$ cm$^{-3}$, corresponding to a surface density of $\Sigma_{\rm ism}= 2\,h\,n_0\simeq 6\times 10^{20}$ cm$^{-2}$ consistent with observations [@Ferriere2001]. We assign 0.9 and 0.1 of 