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MATXRF

       SUBROUTINE  MATXRF (DX,DY,DZ, PX,PY,PZ)
 C$    (Transform -- Reflection Matrix)
 C$    Construct  a  transformation  matrix  corresponding  to   a
 C$    reflection in a plane defined by the normal (DX,DY,DZ) from
 C$    a point (PX,PY,PZ) in the plane.  The stored transformation
 C$    matrix  is  multiplied  on   the  right  by  the   computed
 C$    reflection matrix.
 C$
 C$    MATXSM() sets  the  stored  matrix  to  a  starting  value,
 C$    MATXIM() inquires the current  value, and MATXIO()  selects
 C$    printing of intermediate matrices.
 C$    (08-FEB-90)