Energy evolution in the system for the seven parametric simulations: total magnetic energy (E_mag, top left panel), injected magnetic energy (E_inj ≡ E_mag−E_mag(t = 0)), top right), potential magnetic energy (E_pot, middle left), potential energy variation (E_pot−E_pot(t = 0)), middle right), ratio of the artefact non-solenoidal energy to the total energy (| E_ns | /E_mag, bottom left), and free magnetic energy (E_free, bottom right). The labels are similar to Fig. 2.