Mass-density sequences for models with purely poloidal magnetic field and β₀ = −6. Upper panel: sequences computed at fixed values of the magnetic dipole moment μ (blue lines) and at fixed baryonic mass (green lines), compared with the un-magnetised case (red line). The dotted magenta lines represent the limit for spontaneous scalarisation. Dots mark the position of the maximum mass models UM₀ (red), PM₁ (light blue) and PM₂ (dark blue) of Table 3. The yellow square represents the model of Fig. 8. Lower panel: mass difference of sequences at fixed μ with respect to the un-magnetised one.