The use of one single kaon selection efficiency for all φ momenta was compared to the use of separate values above and below p φ = 1.2 GeV/c. The observed difference in the average multiplicity was 0.9%. This is below the statistical error on the kaon identification efficiencies, hence no additional error was assigned to this source. The statistical error on the kaon selection efficiencies is treated as part of the statistical error in this analysis as it is obtained from the same **data** set as our signal and scales appropriately.