OPR output histograms (.hbook or .root) are in:

 /nfs/babar/DQG/hbook

This directory is organized by processing farm (e.g., ER?) and release.  To query, e.g., run 53971, do:

 > oprruns -f %,prfarm 53971

The output:

     RUN CONS VER PROCSPEC        DATE    SHIFT  DATE     NEVENTS STATUS     PRFARM
   53971    1   0 P18.0.3bV00fb   050428  Day    14:06     619850 done       ER6

tells you that the histogram file can be found in:

 /nfs/babar/DQG/hbook/ER6/18.0.3b

--ks chaisang
     14 jun 2005