  We reconstruct the neutrino mass matrix in the flavor basis, using
experimental data on neutrino oscillations. Both normal and inverted hierarchy
(ordering) of the mass spectrum are considered. The dependence of the matrix
structure on CP violating Majorana phases $\rho$ and $\sigma$ is studied. The
results are shown in $\rho-\sigma$ plots. We find the possible matrix
structures in the different regions of parameters and discuss the perspectives
to further restrict the matrix structure in future experiments.
