• To establish the contribution to the systematic uncertainty from the simulation of R 2 , the number of φ mesons from BB events is estimated again without the R 2 requirement, and the same procedure is applied to the Monte Carlo. The fraction of φ mesons from B decays with R 2 < 0.25 in **data** is (78.18±0.80)% while this fraction in Monte Carlo is (78.00±0.09)%, in agreement within statistical errors. We also investigate the two decay models mentioned above for their effect on the R 2 selection. We find that the largest difference between the models and our Monte Carlo distribution is 0.5%, and we take this difference as a systematic uncertainty.