SUBROUTINE UGINIT                                                         
*                                                                               
*     To initialise GEANT/USER  program and read data cards                     
*
      CHARACTER*20 filnam                                                                                                                                                                                                                             
*                                                                               
* *** Define the GEANT parameters                                                          
      CALL GINIT 
      
* *** read data cards
      PRINT *, 'G3 > gives the filename of the data cards to be read:'
      READ (*,'(A)') filnam
      IF (filnam.EQ.' ') filnam = 'run01.dat'
      OPEN (unit=5,file=filnam,status='unknown',form='formatted')                                                                          

* *** read data cards                                                           
      CALL GFFGO                                                                      
*                                                                               
      CALL GZINIT                                                               
      CALL GPART 
*
      CALL GDINIT                                                                     
*                                                                               
* *** Geometry and materials description                                        
      CALL UGEOM                                                                
*                                                                               
* *** Energy loss and cross-sections initialisations                            
      CALL GPHYSI                                                               
*                                                                               
      CALL GPRINT('MATE',0)                                                     
      CALL GPRINT('TMED',0)                                                     
      CALL GPRINT('VOLU',0)                                                     
*                                                                                                                                                              
* *** Define user histograms                                                    
      CALL UHINIT                                                               
*                                                                               
      END