Universality of continuum percolation

We study by Monte Carlo simulation the universality of continuum percolation for randomly centered disks and spheres. We specifically consider the amplitude ratio of susceptibilities C_-/C₊, which is supposed to be universal, but found to be different from the lattice value. Our data, however, indicate no clear evidence of such a nonuniversal behavior as long as the finite-size effects are taken into account. We also present simulation data for continuum percolation of the penetrable-concentric-shell model.