∆χ² map on the (log s₃, log q₃) parameter plane. The color-coding is configured to correspond to data points based on their ∆χ² values: red for ∆χ² ≤ 1²n, yellow for ≤ 2²n, green for ≤ 3²n, and cyan for ≤ 4²n, where n = 4. The three distinct local solutions are marked as inner, intermediate, and outer. The dashed vertical line represents the geometric mean (s_3,in × s_3,out)^1/2 of the planetary separations for the inner and outer solutions.