  In this paper on mean motion resonances in the Kuiper belt we consider
effects on resonant bodies captured in an earlier migration by determining
levels of chaos as a function of eccentricity, e, at the most stable orbital
configuration. We find the the maximum observed e's at resonance very closely
correspond to orbits with Lyapunov times ~ 1000 orbital periods of
Neptune--much the same number as applies in the asteroid belt with Neptune's
period replaced by Jupiter's. The fact that this number caps the e's of
markedly chaotic but still existing bodies, implies that the great majority of
escapes at equal and larger e's have already occurred. Yet escapes must
continue at some level if the small population in the outermost belt is to be
maintained because typical lifetimes of bodies there are only ~ 1/10 of the
solar system's age. A study of stability at resonance also reinforces the claim
that the post-migration boundary of the inner Kuiper belt lies near 34 AU and
that the primordial, or pre-migration, outer one near 46 AU.
