MEGNO map of the 5:2J MMR. It is calculated for 5000 years in the orbital plane of (2) Pallas for the epoch of 30 September 2012. Chaotic particles with larger MEGNOs are yellow, while relatively stable parts with lower MEGNOs are blue. As the asteroid (2) Pallas is located at (a, e) = (2.77, 0.23), and the members of the family have e ∞ [0.19, 0.364], particles for diffusion are selected along the yellow structures in the eccentricity range of the family from the narrowest part of the resonance.