  We reanalyze electron-proton scattering data in the momentum transfer region
$Q^2 < 1\ GeV^2$, which were used to determine proton electric radius, with
main focus on the Mainz experiment (Bernauer et al., 2010). We examine
dependence of fit results and $\chi^2$ on the cut-off in $Q^2$ and degree of
fitting polynomial, using pseudo-data and compare it with the case of real
experimental data. We find that under some assumptions, the data could be
consistent with the radius, obtained from muonic hydrogen.
