Event 1: visualisation of the forces acting on the CME in Run 03 on 13 July 2012 at 03:53 UT, when the CME leading edge was close to 0.3 AU. Panel a: arrows indicating the direction of the Lorentz force at the β = 0.5 surface. The arrows colour code is based on the magnitude of the Lorentz force (in Pa AU⁻¹). Panel b: magnetic field lines in the CME, coloured based on the angle between the current density j and the magnetic field B (in rad, colour scale between 0 an π/4). The blue 3D surface marks the contour of the β = 0.5 surface. The black line indicates the direction to Earth. The spherical 3D surface represents the heliospheric inner boundary at 0.1 AU.