C-----------------------------------------------------------------------
C  This subroutine calculates the Cartesian coordinates of a reflection
C-----------------------------------------------------------------------
      SUBROUTINE CARTC (XP,YP,ZP)
      INCLUDE 'COMDIF'
      CO = COS((OMEGA)/DEG)
      SO = SIN((OMEGA)/DEG)
      CC = COS((CHI)/DEG)
      SC = SIN((CHI)/DEG)
      CP = COS((PHI)/DEG)
      SP = SIN((PHI)/DEG)
      ENGTH = 2*SIN((THETA/2)/DEG)
      XP = ENGTH*(CO*CC*CP - SO*SP)
      YP = ENGTH*(CO*CC*SP + SO*CP)
      ZP = ENGTH*CO*SC
      RETURN
      END