A. Putze et al.: An MCMC technique to sample transport and source parameters of Galactic cosmic rays. II. Fig. 6. Model II (diffusion/reacc eleration): marginalised posterior PDF of the diffusive halo size L (right panels of the first and second row) and the local b ubble radius r$_{h}$ (right panel of the last row) for the standard ( r$_{h}$ = 0, first row) and the modified DM ( r$_{h}$ = 0, second a nd last row), as constrained by using B/C and $^{10}$Be/$^{9}$Be data. The correlations between the geometrical parameters L a n d r$_{h}$ and the transport parameters δ , K$_{0}$ , and V$_{a}$ , are shown in the 2D histograms. The colour code corresponds to the regions of increasing probability (from paler to darker shades), and the two contours (smoothed) delimit regions conta ining respectively 68% and 95% (inner and outer contour) of the PDF. Fig. 7. Model III (diffusion/convection/reacceleration): same as in Fig. 6. The transport parameters are now δ , K$_{0}$ , V$_{a}$ , and V$_{c}$ , with the geometrical parameters L and r$_{h}$ . on the other parameters, which is different for models II and III. Standard DM ( r$_{h}$ = 0 ): the parameter L is constrained to be between 4 . 6 and 5 . 9 kpc for model II, having a most probable value at 5.2 kpc—a result compatible with other 10 4 6 8 0 0.2 0.4 0.6 L [kpc]  = 0 h r 4 6 8 0.22 0.24 L [kpc] 4 6 8 0.1 0.15 0.2 /Myr] 2  [kpc 0 K L [kpc] 4 6 8 80 100  [km/s] a V L [kpc] 2 4 6 0 0.2 0.4 L [kpc]  0 h r Model II 2 4 6 0.22 0.24 L [kpc] 2 4 6 0.05 0.1 0.15 /Myr] 2  [kpc 0 K L [kpc] 2 4 6 40 60 80 100  [km/s] a V L [kpc] 0 0.05 0.1 0.15 2 4 6  [kpc] h r L [kpc] 0 0.05 0.1 0.15 0.22 0.24  [kpc] h r 0 0.05 0.1 0.15 0.05 0.1 0.15  [kpc] h r /Myr] 2  [kpc 0 K 0 0.05 0.1 0.15 40 60 80 100  [kpc] h r  [km/s] a V 0 0.05 0.1 0.15 0 5 10  [kpc] h r 40 60 80 0 0.02 0.04 L [kpc]  = 0 h r 40 60 80 19 20  [km/s] c V L [kpc] 40 60 80 0.8 0.9 L [kpc] 40 60 80 0.04 0.06 0.08 /Myr] 2  [kpc 0 K L [kpc] 40 60 80 120 140 160  [km/s] a V L [kpc] 0 20 40 60 0 0.02 0.04 0.06 L [kpc]  0 h r Model III 0 20 40 60 18 19 20  [km/s] c V L [kpc] 0 20 40 60 0.8 0.9 L [kpc] 0 20 40 60 0 0.02 0.04 0.06 /Myr] 2  [kpc 0 K L [kpc] 0 20 40 60 0 50 100 150  [km/s] a V L [kpc] 0 0.05 0.1 0.15 0 20 40 60  [kpc] h r L [kpc] 0 0.05 0.1 0.15 18 19 20  [kpc] h r  [km/s] c V 0 0.05 0.1 0.15 0.8 0.9  [kpc] h r 0 0.05 0.1 0.15 0 0.02 0.04 0.06  [kpc] h r /Myr] 2  [kpc 0 K 0 0.05 0.1 0.15 0 50 100 150  [kpc] h r  [km/s] a V 0 0.05 0.1 0.15 0 10 20 30  [kpc] h r