Total magnetic field in a single superbubble, ⟨B_SB⟩, or mean magnetic field in SN remnants, ⟨B_SN⟩, injected by a stellar population of mass M_cluster. The top panel assumes bimodal magnetic field distributions (top panel of Fig. 1) and the bottom one assumes Gaussian ones (bottom panel of Fig. 1). Results are shown for different IMFs, with the shaded areas indicating the range over different stellar magnetic field distributions.