*-- Author : S.Burke / J.V. Morris
      SUBROUTINE FKRPXY(SIN,CIN,SOUT,COUT)
**********************************************************************                                        
*                                                                    *                                        
* Transform a state vector and covariance from (R,PHI) to (x,y)      *                                        
*                                                                    *                                        
* Both are assumed to be at fixed z.                                 *                                        
*                                                                    *                                        
*                        *** NOT TESTED ***                          *                                        
*                                                                    *                                        
**********************************************************************                                        
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      CALL UCOPY(SIN(3),SOUT(3),6)                                                                     
      CALL UCOPY(CIN(3,3),COUT(3,3),26)                                                                
*