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We consider the dependences of the average number of interacting nucleons inhigh energy heavy ion collisions on the impact parameter in two cases, when thecolliding nuclei have equal atomic weights, and when one nucleus issignificantly more heavy in comparison with the second one. We argue that inthe case of trigger of some rare event (say, $J/\psi$, or $\Upsilon$production) the multiplicity of the secondaries can change several times forminimum bias sample, but it should be stable in the case of central events.Comment: 9 pages, LaTeX + 3 PostScript figure

Impact-parameter dependences of the number of interacting nucleons and mean multiplicities in heavy-ion collisions