Fig. 3
The mass of a perturbing planet that could generate a TTV signal with an observed amplitude of 73 s, as a function of ratio of orbital periods of transiting planet, Pb, and the perturber, Pp. Vertical dashed lines indicate MMRs. Orbits in the range of Pp/Pb between 0.69 and 1.45, marked by a grey area, were found to be unstable. The case of Pp/Pb = 1 was found to be stable but was skipped in the plot.
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