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VISHS

       SUBROUTINE  VISHS (F1,F2, J1,J2,NP, I1,I2,NT, N1,N2, L,M, B, O,
      X                   PR2, PL2)
 C$    (Hemispherical Sequence)
 C$    Plot a  hidden line  view  of two  functions defined  on  a
 C$    hemisphere.  The arguments are:
 C$
 C$    F1(NP,NT)......Array containing first function.
 C$    F2(NP,NT)......Array containing second function.
 C$    (J1,J2)........Interval of PHI indices to be graphed.
 C$    (I1,I2)........Interval of THETA indices to be graphed.
 C$    L..............Direction of view and increment (+: west,
 C$                   -: east).
 C$    M..............Direction of view and increment (+: south,
 C$                   -: north).
 C$    B=.............(ATAN2 cut line does not fall in quadrant
 C$                   being graphed) .
 C$    O(3,3).........Orthogonal rotation matrix.
 C$    PR2............2-D projection subroutine
 C$    PL2............2-D pen movement subroutine, usually PL2CA.
 C$    (09-APR-82)