*-- Author : Stephen Burke  30/11/92
      LOGICAL FUNCTION FFKILL(J1,J2)
*-----------------------------------------Updates 27/07/93-------                                             
**: FFKILL 30907 SB. Changes to monitoring histograms.                                                        
**: FFKILL 30907 RP. Farm changes.                                                                            
*-----------------------------------------Updates 03/03/93-------                                             
**: FFKILL 30907 SB. Cuts can be turned off with negative values.                                             
*-----------------------------------------Updates 30/11/92-------                                             
**: FFKILL 30907 SB. New deck to remove bad tracks.                                                           
*-----------------------------------------Updates----------------                                             
**********************************************************************                                        
*                                                                    *                                        
* Decide whether to reject a track                                   *                                        
*                                                                    *                                        
**********************************************************************                                        
*KEEP,FTHIST.                                                                                                 
* indices of filter farm histos                                                                               
*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,FFSCAL.                                                                                                 
* Counters                                                                                                    
*KEEP,FKCONS.                                                                                                 
*KEEP,FKSMTH.                                                                                                 
*KEND.                                                                                                        
**********************************************************************                                        
* Momentum too small?                                                                                         
* Theta too big?                                                                                              
* Start/end outside tracker?                                                                                  
* Swim from start to end ...                                                                                  
      CALL FKTRAN(DZ,ZPL(J1),SSMT(1,J1),S1,DTRAN)
      CALL FKMUL(CSMT(1,1,J1),DTRAN,C1)
* ... allow for multiple scattering - assume av. rad. length is 10 cm (!                                      
      CALL FKSCAT(DZ,SSMT(1,J1),RADLEN,DTRAN,QMS)
      CALL FKQADD(C1,QMS)
* ... find difference between end parameters and extrapolation ...                                            
      CALL FKDIFF(SSMT(1,J2),S1,S2)
      CALL FKADD(CSMT(1,1,J2),C1,C2)
      CALL DSINV(5,C2,5,IFAIL)                                                                         
* ... and calculate chi-squared                                                                               
C      CALL SHS(20,0,SNGL(CHI12))                                                                             
*