*-- Author : Stephen Burke
      SUBROUTINE FFXTRP(JTRUE,S)
*-----------------------------------------Updates 02/06/92-------                                             
**: FFXTRP.......SB. Change loop indices to please farm.                                                      
*-----------------------------------------Updates 07/02/92-------                                             
**: FFXTRP 30205.SB. Initialise IPF and IRF to please UNDEF.                                                  
*-----------------------------------------Updates----------------                                             
**********************************************************************                                        
*                                                                    *                                        
* Fill the TRUE array from the track JTRUE using the FRPF/FRRF banks *                                        
*                                                                    *                                        
**********************************************************************                                        
*KEEP,FKNPL.                                                                                                  
*                                                                                                             
* Per-track values can go in H1WORK; note that LTRUE and LFIRST must                                          
* be set at least per event.                                                                                  
*                                                                                                             
* This is about 36k words long; the remaining common blocks are                                               
* about 3.6k in total. Some of this could be in /H1WORK/, but the                                             
* blocks would have to be reorganised.                                                                        
*                                                                                                             
* /FKPROJ/                                                                                                    
* /FKFILT/                                                                                                    
* /FKSMTH/                                                                                                    
* /FKINT/                                                                                                     
* /FKRSID/                                                                                                    
* /FKTRUE/                                                                                                    
* /FKDBG/                                                                                                     
*KEEP,FFSTEE.                                                                                                 
*KEEP,FKCONS.                                                                                                 
*KEEP,FKTRUE.                                                                                                 
*KEEP,FKPIDP.                                                                                                 
*KEEP,BCS.                                                                                                    
*KEEP,STFUNCT.                                                                                                
*     index of element before row number IROW                                                                 
*     index of L'th element  of row number IROW                                                               
*     L'th integer element of the IROW'th row of bank with index IND                                          
*     L'th real element of the IROW'th row of bank with index IND                                             
*KEND.                                                                                                        
**********************************************************************                                        
      INDPF = NLINK('FRPF',0)
      INDRF = NLINK('FRRF',0)
* This isn't actually necessary, but it stops UNDEF complaining                                               
      CALL VZERO(IPF,9)                                                                                
      CALL VZERO(IRF,3)                                                                                
            CALL FKTRAN(DZ,Z,S,TRUE(1,JPL),DTRAN)
*