\hline & Data  & MC   \\\hline
  ee & 5489 & 5561   \\ 
  \mu\mu   & 8714 & 9160   \\ 
  OF   & 13322 & 13480   \\ 
  SF   & 14203 & 14719   \\ \hline
  R_{\mathrm{SF/OF}}   & 1.066 \pm 0.013 & 1.092 \pm 0.043  \\ \hline