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We report the first Monte Carlo study of the average critical number of bonds per site B₂ for three-dimensional continuum systems. The results show that for a system of spheres the dependence of B₂ on the soft-shell to hard-core ratio can be mapped onto the site-percolation--bond-percolation transition in lattices. For a system of very long cylinders, B₂ appears to be a dimensional invariant. It is predicted that for any continuum system the above dependence will be equal or weaker than that of a system of spheres.
Balberg et al. (Mon,) studied this question.