Left panel: contour of the density after the driving has finished for the experiment where a driver amplitude of υ_driv = 10⁻²υ_A0 is used. Right panel: density along one of the outer most resonant field lines for all three experiments, where the same colour scheme is used as in previous plots. The value l_max is equal to twice the length of the field line and l is a variable giving the distance from the centre of the field line.