  We study a model in which a closed universe with dust and quintessence matter
components may look like an accelerated flat Friedmann-Robertson-Walker (FRW)
universe at low redshifts. Several quantities relevant to the model are
expressed in terms of observed density parameters, $\Omega_M$ and
$\Omega_{\Lambda}$, and of the associated density parameter $\Omega_Q$ related
to the quintessence scalar field $Q$.
