FFCHTR COMMENTS
*-- Author : Stephen Burke
      SUBROUTINE FFCHTR(JPL,JTYPE,JDIG)
*-----------------------------------------Updates 02/06/92-------                                             
**: FVCHTR.......SB. Change loop indices to please farm.                                                      
*-----------------------------------------Updates 24/01/92-------                                             
**: FFCHTR 30205.SB. Check to see if the drift sign is correct.                                               
*-----------------------------------------Updates----------------                                             
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*                                                                    *                                        
* Update LTRPL for a new digi (found by FKHUNT)                      *                                        
*                                                                    *                                        
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*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,FFWBI.                                                                                                  
* Work bank indices (note that INDKTR is *NOT* a work bank index!)                                            
*KEEP,FFDBG.                                                                                                  
*KEEP,FKDBG.                                                                                                  
*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.                                                                                                        
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*