Two stages of the mass growth of the HD 45364 planets (in logarithmic scale). During the first stage (blue line) which lasts 10⁶ yr, the equal-mass planets grow with the same rate, from 0.1   M_⊕ to ~10.0  M_⊕. During the second stage, the runaway growth occurs with different rates in such a way that the inner planet (black line) reaches 0.187  M_J and the outer planet (red line) 0.658 M_J after ~ 1.5 × 10⁵ years.