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We review our evaluation of forward dispersion relations for direct fits tothe different, and often conflicting, pion-pion scattering experimentalanalyses. We find that some of the most commonly used data sets do not satisfythese constraints by several standard deviations. We also provide a consistentpion-pion amplitude by improving a global fit to data with these dispersionrelations.Comment: To appear in the Proceedings of the XI. International Conference on  Hadron Spectroscopy- HADRON05. Rio de Janeiro. 21st-25th August. 200

Consistency checks of different ππ scattering data sets using forward dispersion relations