Left panel: profile of the mean and median magnetic field strength as a function of distance from the source, in the vicinity of the source in our simulation volume. The profile shown corresponds to a normalisation factor B₀ = 50 nG (see text). Right panel: slice through the plane of the source in our magnetic field simulation volume corresponding to B₀ = 1 nG. The colour bar gives the strength of the magnetic field B in units of log (B/ G).