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We use the unitary and analytic model of the pion electromagnetic form factorin order to evaluate in the lowest order the $e^{+}e^{-}\to\pi^{+}\pi^{-}$contribution into the muon magnetic anomaly. We demonstrate, that thistechnique enables us to reduce the uncertainty of the theoretical predictionimportantly in comparison to usual approaches, where the measured data areintegrated directly.

Remarkable suppression of the $e^{+}e^{-}\to\pi^{+}\pi^{-}$ contribution error into muon $g-2$