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The question of how one can distinguish quark model states from 2-hadronstates near an S-wave theshold is discussed, and the usefulness of the runningmass is emphasized as the meeting ground for experiment and theory and fordefining resonance parameters.Comment: 10 pages in Latex + 2 figures available on request. Helsinki preprint  HU-SEFT R 1994-0

How to parametrize anS-wave resonance and how to identify two-hadron composites