CR differential energy density spectra de/dp for the ¹²C (top) and ¹¹B (bottom) isotopes in model A1 (left) and model C1 (right), after 500 Myr evolution, taken at the same altitude points as for the previous figure. Also as for Figure 6, the red dashed lines represent the initial slopes a_L and a_R of the primary injection spectrum. For each spectrum, a fit slope estimation is given, with a_L being the slope at nonrelativistic energy and a_R being the slope at relativistic energy. The change of slope in the low-energy range is more visible, because of the transrelativistic transition, the spallation process, and the Coulomb energy loss.