three-dimensional (3D) visualisation of a freshly injected PUIs in velocity space in the SW frame of reference. The green arrows represent the SW bulk velocity, the black arrows show the local magnetic field, the blue arrows show the ISN velocity, and the amber ring shows the initial PUI VDF. The green hemisphere is a cut-out of the sphere of the entirety of velocities of fresh PUIs at the depicted setup of the SW velocity and ISN velocity. The different visualisations depict in total five different magnetic field configurations, and the other parameters are kept constant.