Proton (top) and electron (bottom) MFPs are shown, as required for reproducing CR spectra measured by PAMELA between July 2006 and December 2009. The solid, dashed and dashed-dotted lines represent the parallel MFPs (λ_∥), and the perpendicular MFPs in the radial (λ_{⊥ r}) and polar (λ_{⊥ θ}) directions, respectively. The lowest dotted lines represent the drift scale (λ_A). As indicated by the legend, the modulation parameters from the second half of 2006 (2006b) to the second half of 2009 (2009b) are given by the coloured lines changing from red to blue.