Relative dipole strength plotted against the ratio of axisymmetric toroidal kinetic energy divided by toroidal energy. Red (grey) symbols correspond to simulations in thick (thin) shells (η = 0.2 and η = 0.6, respectively). Each type of symbol is associated with a specific density stratification (from Boussinesq, i.e. N_ρ = 0 to N_ρ = 3). The sizes of the symbols were chosen according to the values of the modified Elsasser number (Eq. (13)).