Figure 5: The allowed ranges in the - parameter space, both in the standard three-neutrino picture and with one sterile neutrino for the 3+1 IO case. Top left panel upper and lower band range are obtained in the mass term combination of (+,+,-) and (-,-,+), while right panel upper and lower band range are obtained in the mass term combination of (+,+,-) and (-,-,-). Bottom upper and lower band range are obtained in the mass term combination of (+,+,+) and (-,-,+). The signs indicate the signs of 1; these are the extreme cases which determine the minimum and maximum value of in which CP is conserved.