Description of Data

  
* variables for charged tracks:
    EV   event number
    PA   particle type 
    TH   theta
    PH   phi
    PC   momentum*charge
    DO   d0
    EE   ECAL energy
    EH   HCAL energy
    DE   dE/dx
    SA   dE/dx samples
    MU   MUON hits
  
* variables for photons:
    EV   event number
    PA   particle type 
    TH   theta
    PH   phi
    PC   energy
    DO   null
    EE   ECAL energy fraction, stack 1
    EH   ECAL energy fraction, stack 2
   
* particle types
*   0  undefined
*   1  photon
*   2  positron
*   3  electron
*   4  neutrino
*   5  muon +
*   6  muon -
*   7  pion 0
*   8  pion +
*   9  pion -
*

C  the input ntuple
      REAL
     +EV      ,PA      ,TH      ,PH      ,PC      ,DO      ,
     +EE      ,EH      ,DE      ,SA      ,MU