Data points along a single field line, obtained by means of the semi-empirical shock modelling technique along with the corresponding fits by the analytic functions implemented in CSA. The top panels show the shock-normal cosine cos θ_Bn (left) and the shock speed (right) along the field line V _s, both as functions of time τ after the first shock-crossing of the field line, and the bottom panels show the magnetic field strength B (left) and the plasma density n (right), bothas functions of the radial position s + r₀, where r₀= d₀ + d₁ (see text fordetails). In each plot, the values of the corresponding fitting parameters are given as well.