Cosmic Ray Energy And Mass Estimator (V2.1)

An extensive air shower with a
   zenith angleTheta = +- degrees
has at observation level (m a.s.l.) an
   electron number lg(Ne) = +- (>3MeV)
and a total (<0 -> truncated)
   muon numberlg(Nm) = +- (>100MeV)!

What was the primary cosmic ray's energy and mass?