Finally, we study an arbitration method when more than one combinations are found in an event. The method we choose is to require that when a photon is shared between two or more that meet all of the other requirements, the combination with the lowest is used . The other combinations are disregarded. This will usually keep only one per event, but two , each of which have two distinct photons, can also be kept. Since the depends on how well the reconstructed mass matches the nominal mass, this requirement is more effective as the mass cut window is enlarged. The signals which pass and fail this arbitration requirement are shown in dpi0:pi0_arb.