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We report a direct measurement of $D^0-overline{D}^0$ mixing parametersthrough a time-dependent amplitude analysis of the Dalitz plots of $D^0\rightarrow K_S^0 \pi^+ \pi^-$ and, for the first time, $D^0 \rightarrow K_S^0K^+ K^-$ decays. The low-momentum pion $\pi_s^+$ in the decay $D^{*+}\rightarrow D^0 \pi_s^+$ identifies the flavor of the neutral $D$ meson at itsproduction. Using 468.5 fb$^{-1}$ of $e^+e^-$ colliding-beam data recorded near$\sqrt s = 10.6$~GeV by the BABAR detector at the PEP-II asymmetric-energycollider at SLAC, we measure the mixing parameters $x= [1.6 \pm 2.3 ({\rmstat.}) \pm 1.2 ({\rm syst.}) \pm 0.8 ({\rm model}) ] \times10^{-3}$, and $y=[5.7 \pm 2.0 ({\rm stat.}) \pm 1.3 ({\rm syst.}) \pm 0.7 ({\rm model}) ]\times10^{-3}$. These results provide the best measurement to date of $x$ and $y$.The knowledge of the value of $x$, in particular, is crucial for understandingthe origin of mixing.

Measurement of D0-antiD0 mixing parameters using D0 -> K0S pi+ pi- and D0 -> KS0 K+ K- decays