Isocontours of the neutrino vacuum appearance probability as a function of the three-neutrino CP phase δ_CP (abscissa) and a new “seesaw” phase φ deriving from nonunitarity (ordinate). Black lines correspond to the standard value δ_CP = 3π/2; blue (red) domain corresponds to a 10% (20%) deviation. Range is from zero to 2π for both axes.

From the article:

New Ambiguity in Probing $CP$ Violation in Neutrino Oscillations
O. G. Miranda, M. Tórtola, and J. W. F. Valle
Phys. Rev. Lett. 117, 061804 (2016)

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