Ratios 𝒮 (top panels) and 𝒢 (bottom panels) as functions of the baryonic mass M₀ of models with a purely toroidal magnetic field (left panels) and with a purely poloidal magnetic field (right panels), for different value of β₀: from β₀ = −6 (blue curve) up to β₀ = −4.5 (light red curve) increasing by 0.25 with every line. The red line corresponds to GR, where 𝒮 = 0 and 𝒢 = 1. Solid lines are the ratios computed by keeping B̃_max fixed, while dashed lines are obtained by keeping fixed. Markers show the models with minimum 𝒢: circles for solid lines and squares for dashed lines.