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The $f_0$ mesons are studied in a combined analysis of data on the isoscalarS-wave processes $\pi\pi\to\pi\pi,K\overline{K},\eta\eta$ and on decays$J/\psi\to\phi(\pi\pi, K\overline{K})$, $\psi(2S)\to J/\psi(\pi\pi)$, and$\Upsilon(2S)\to\Upsilon(1S)\pi\pi$ from the Argus, Crystal Ball, CLEO, CUSB,DM2, Mark II, Mark III, and BES II collaborations. The method of analysis,based on analyticity and unitarity and using an uniformization procedure, isset forth with some details. Some spectroscopic implications from results ofthe analysis are discussed.

The scalar mesons in multi-channel $\pi\pi$ scattering and decays of the $\psi$ and $\Upsilon$ families