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The wave function at the origin (WFO) is an important quantity in studyingmany physical problems concerning heavy quarkonia. However, when one used thevariational method with fewer parameters, in general, the deviation ofresultant WFO from the "accurate" solution was not well estimated. In thispaper, we discuss this issue by employing several potential forms and trialwave functions in detail and study the relation between WFO and the reducedmass.Comment: 17 pages, .zip file of the LATEX2

Variational estimation of the wave function at the origin for heavy quarkonium