CP violation discovery at as a function of for a betabeam, SPL, and T2HK. The combination of SPL and a betabeam is also shown. The betabeam lines correspond to decays per year of 6He (18Ne). Details of the simulations can be found in [68]. The width of the bands reflects the change of the systematic errors from 2% to 5%. The dashed curves are obtained for a betabeam flux reduced by a factor of two.
