Proton spectra volume-averaged downstream of the FS at early times: for context, we also provide the gas number density, n, as a function of radius. The second row displays the compression ratio (Cr_RATPaC) and the shock speed (V_sh) up to the specific age, the third row depicts the magnetic-field profile (B), and the fourth row illustrates the proton spectra. The vertical lines in the first and the third row mark the FS position.