Energy levels sections in the plane defined by sinσ₁ = sinσ₂ = 0 for the 2:1 resonance (A1 to F1), and the 3:2 resonance (A2 to F2). The constant G/G₀ − 1 is set to −10^-3 (A1, A2), −5 × 10^-4 (B1, B2), −10^-4 (C1, C2), −3.2 × 10^-5 (D1, D2), −3 × 10^-5 (E1, E2), and  + 10^-3 (F1, F2). Stable ACR solutions are highlighted with colored dots (red and green). Unstable ones are highlighted with colored crosses (blue). The star mass is given by m₀ = m_⊙ and planets masses by m₁ = m₂ = m _⊕ . The Hamiltonian is developed up to degree 4-1. Note that the scales are different for graphs A1, A2, B1, and B2 than for other graphs.