Same as in Fig. 5 but varying the convective wind velocity V_C instead of the normalization K₀ or the spectral index δ of the space diffusion coefficient. The blue and green curves correspond to the lowest (5 km s^-1) and highest (14 km s^-1) values of V_C respectively. While fairly small at 30 GeV (left panel), the effect increases at 1 GeV (right panel).