LMA parameters and non-zero $U_{e3}$ effects on atmospheric $\nu$ data?
  We study the possible manifestation of the interference between the effects produced in the atmospheric neutrinos due to oscillation driven by the solar parameters parameters $\Delta m^2_{21}$, $\sin^2 2\theta_{21}$ and due to oscillation driven by $U_{e3}$. 
O. L. G. Peres and A. Yu. Smirnov