TTVs of TOI-4562 b, from V. Fermiano et al. (2024). Colored lines show predictions of dynamical models with companions near different N:1 MMRs. For the purposes of visualization, the 6:1 and 16:1 models have been spaced vertically by arbitrary offsets of 20 minutes. All models match the transit times to high precision (χ²  <  10⁻³) despite having companions with very different periods (1280–3521 days), masses (146–1180 M_⊕), and eccentricities (0.15–0.46). In this case, there is no unique solution to the TTV inversion problem.