Nhep           -> actural number of entry
Idhep[Nhep]    -> particle id, according to the PDG standards
Phep[Nhep][i]  -> 4 momenta
                 PHEP(1,IHEP),PHEP(2,IHEP),PHEP(3,IHEP) px,py,pz in GeV
                 PHEP(4,IHEP) energy in GEV
                 PHEP(5,IHEP) mass in GeV
Vhep[Nhep][i]  -> 4 vertices
                  VHEP(1,IHEP),VHEP(2,IHEP),VHEP(3,IHEP) spatial x,y,z
                  VHEP(4,IHEP) production time in mm/c= 3.33 ps
ISTHEP[Nhep]   -> particle status code
                  0 null entry
                  1 an existing entry w/no decy or fragmentation
                  2 an entry which has decayed or fragmented
IDHEP[Nhep]    -> particle identifiers
JMOHEP[Nhep]   -> mother-daughter relationships
                  JMOHEP(1,IHEP) pointer where the mother is stored
                  JMOHEP(2,IHEP) pointer to the second mother if there are two mother
JDAHEP[Nhep]   -> pointer to the daughters
                  JDAHEP(1,IHEP) pointer to the first daughter
                  JDAHEP(2,IHEP) pointer to the last daughter
Nevhep   -> event number
MC Parameters
        Ievt     ->
        Irun     ->
        Param    ->
        Nparam   ->
        Weight   ->