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We report on a study of the invariant mass spectrum of the hadronic system in the decay τ − → π − π 0 ν τ. This study was performed with data obtained with the CLEO II detector operating at the CESR e + e − collider. We present fits to phenomenological models in which resonance parameters associated with the ρ(770) and ρ(1450) mesons are determined. The π −(More)