[Total elapsed time: 0:07m  processed files: 1  processed events: 61540413  8.79e+06 evt/s]
Events with exactly two muons: pass=31104343   all=61540413   -- eff=50.54 % cumulative eff=50.54 %
Muons with opposite charge: pass=24067843   all=31104343   -- eff=77.38 % cumulative eff=39.11 %