  The data available from the A2 Collaboration at MAMI were analyzed to select
the $\gamma p\to \pi^0\eta p$ reaction on an event-by-event basis, which allows
for partial-wave analyses of three-body final states to obtain more reliable
results, compared to fits to measured distributions. These data provide the
world's best statistical accuracy in the energy range from threshold to
$E_{\gamma}=1.45$ GeV, allowing a finer energy binning in the measurement of
all observables needed for understanding the reaction dynamics. The results
obtained for the measured observables are compared to existing models, and the
impact from the new data is checked by the fit with the revised Mainz model.
