Magnetic field in the cluster core (left) and superbubble interior (right). Triangles mark distributions before the WR onset at 200 kyr, and circles indicate distributions after the WR onset at 390 kyr. Colours indicate different simulation runs (see Table 1 for run parameters). Filled markers show the mean, empty markers the median. Whiskers indicate the 25th and 75th percentiles. Asymmetries due to local wind interactions are larger in the core, as evident by the broader distributions, but are reduced when the flow reaches the superbubble. We note that the distributions are shown in log space.