  Ring diagram analysis can be used to study large scale velocity fields in the
outer part of the solar convection zone. All previous works assume that the
peak profiles in the solar oscillation power spectrum are symmetric. However,
it has now been demonstrated that the peaks are not symmetric. In this work we
study how the explicit use of asymmetric peak profiles in ring-diagram analysis
influences the estimated velocity fields. We find that the use of asymmetric
profiles leads to significant improvement in the fits, but the estimated
velocity fields are not substantially different from those obtained using a
symmetric profile to fit the peaks. The resulting velocity fields are compared
with those obtained by other investigators.
