Diffusion (red) and advection (blue) timescales as a function of transported distance, assuming particles start at the termination shock at R_ts = 20.4 pc. Timescales for three different diffusion coefficients are shown, following Eqs. (9) and (12). The grey band indicates the radius of the source, where the large range is due to the elongated shape. Cooling times for electrons of four different energies are indicated (black). In addition to a fiducial value (10 TeV), the average parent electron energies we determine for the H.E.S.S. maps (see HC22, Fig. 3) are shown. The technique used is detailed in the text.