Histograming

To avoid clashes between different subsystems the following scheme is introduced for histogram subdirectories:

• directory /GEANT -- contains histogram related to GEANT processing of the events such as
  • time per event
  • memory used for event
  • total number of long life tracks per event
  • maximum stack size per event
  • 
• directory /GENE -- contains information about the generated (input) event: total and charged particle multiplicities, Z-coordinate of interaction, average energy versus pseudorapidity, -distribution,
• directory /USER -- contains histogram for the user

A directory structure closely following the structure defined in the SETUP title block (see section 3.5.1) is reproduced for the detector specific part. For example, the following subdirectories would be created:
directory /TRAK -- contains histogram for the Central tracker
directory /CALO/ECAL -- contains histogram for the electromagnetic calorimeters
directory /CALO/HCAL -- ditto for the Hadron calorimeters
directory /CALO/VCAL -- ditto for the Very Forward calorimeters
directory /MUON -- ditto for the Muon system
directory /TRIG -- ditto for the trigger
Before booking/filling histograms one should to go to the right directory using the HBOOK routine HCDIR. E.g. before making VCAL histograms one should have CALL HCDIR('//PAWC/CALO/VCAL/',' ').