MEGNO maps in the a–e parameter space for the two-planet configuration for four different scenarios (as shown in Table 2). The dark-purple areas correspond to stable orbits where minor bodies may reside. On the other hand, yellow areas correspond to unstable regions from which a minor body would be expelled. Three main stable regions are found: A, B, and C. Vertical dashed-lines represent the MMRs found in the system between the minor bodies and the planets GJ 273b and GJ 273c.