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We measure the $D^0 - {\bar{D}}^0$ mixing parameters using a time-dependentamplitude analysis of the decay $D^0\to\pi^+\pi^-\pi^0$. The data were recordedwith the BABAR detector at center-of-mass energies at and near the$\Upsilon(4S)$ resonance, and correspond to an integrated luminosity ofapproximately 468.1 ${\rm fb}^{-1}$. The neutral $D$ meson candidates areselected from $D^{*}(2010)^+\to D^0 \pi_s^+$ decays where the flavor at theproduction is identified by the charge of the low momentum pion, $\pi_s^+$. Themeasured mixing parameters are $x = (1.5\pm1.2\pm0.6) \%$ and $y =(0.2\pm0.9\pm0.5) \%$, where the quoted uncertainties are statistical andsystematic, respectively.

Measurement of the neutral $D$ meson mixing parameters in a time-dependent amplitude analysis of the $D^0\to\pi^+\pi^-\pi^0$ decay