Orrery of the three-planets systems sufficiently close to first order mean motion resonances k : k − 1 with k =2, 3, with a normalised distance to resonance |Δ| < 0.05 for both pairs. For each system, we place a circle in correspondence of the period of each planet, and indicate between pairs of planets the first order mean motion resonance in which they are envisioned to reside (below) and the normalised distance to that resonance Δ (above); the sign of Δ indicates if the pair of planets are narrow (Δ < 0) or wide (Δ > 0) of the resonance. For our analysis, we will only consider systems for which Δ > 0 for both pairs (the systems enclosed by a box). The size of the circle is an indication of the estimated radius of the planet (the small dot in the top right corner demonstrates the size of Earth). For YZ Ceti this information is not available, but this does not pose a problem for our study.