  We present perturbative oscillation probabilities for electron and muon
channels including non-standard interaction (NSI) effects. The perturbation was
performed in standard parameters $\Delta m^2_{21}/\Delta m^2_{31}$ and
$\sin^2{(\theta_{13})}$ as in non-standard interaction couplings. Our goal is
to match non-standard parameters with the standard ones. This leads to
oscillation probabilities with NSI compact and with functional structure
similar to the Standard Oscillation (SO) case. Such formalism allows us to
recognize degeneracies between standard oscillation parameters and NSI
parameters. In such scenario, we also have an educated guess about the origin
of the reported behavior of long-baseline experiments degeneracies, which
should be due to marginalization on standard oscillation parameters
$\delta_{\rm CP}$, $\theta_{23}$ and NSI parameters.
