  The processes $D^0\to K^0 K^-\pi^+$ and $D^0\to\ok K^+\pi^-$ involve
intermediate vector resonances whose amplitudes and phases are related to each
other via flavor SU(3) symmetry. A closer look at Dalitz plots for these two
processes is expected to shed light on our understanding of the usefulness of
flavor SU(3) symmetry in studying charm decays. In the present work we use data
from the BaBar Collaboration's publication in 2002. The goal is to reproduce
Dalitz plot amplitudes and phases assuming flavor SU(3) symmetry and compare
them with experiment.
  While an SU(3) fit is able to account for the relative magnitudes of the
amplitudes for the decays $D^0 \to K^{*-}K^+$ and $D^0 \to K^{*+}K^-$, the
current BaBar sample (based on an integrated luminosity of only 22 fb$^{-1}$)
provides only 1--$2 \sigma$ evidence for the decays $D^0\to K^{*0}\ok$ and $D^0
\to \oks K^0$, with magnitudes and phases not in accord with predictions. The
CLEO collaboration could potentially produce an analysis using data with better
statistics, and an analysis based on the full BaBar sample (more than 20 times
the 2002 value) should definitively settle the question.
