Radial velocity and number density at Earth vs. time. The simulation run is performed with the synthetic wind from Sect. 3.1.1 and the CME parameters given in Sect. 3.2. Results for low, middle, and high stretched grid resolutions are given in yellow, orange, and blue, respectively. The red dashed curve and the dark blue dashed curve show non-stretched simulation results for middle resolution and high resolution, respectively. The x-axis corresponds to the days passed since the end of the relaxation phase (14 days into the simulation).