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Mean fidelity amplitude and parametric energy--energy correlations arecalculated exactly for a regular system, which is subject to a chaotic randomperturbation. It turns out that in this particular case under the average bothquantities are identical. The result is compared with the susceptibility ofchaotic systems against random perturbations. Regular systems are moresusceptible against random perturbations than chaotic ones.

Fidelity and level correlations in the transition from regularity to chaos