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VISOS

       SUBROUTINE  VISOS (F1,F2, J1,J2,NP, I1,I2,NT, L,M, S, B, O, PL2)
 C$    (Outer Sequence)
 C$    F1(NP,NT)......Array of values of the first function.
 C$    F2(NP,NT)......Array of values of the second function.
 C$    J1,J2..........Range of X (horizontal coordinate).
 C$    I1,I2..........Range of Y (depth coordinate).
 C$    L..............Direction of view and increment (+: west,
 C$                   -: east).
 C$    M..............Direction of view and increment (+: south,
 C$                   -: north).
 C$    S..............= +1.0, plot positive part of function;  =
 C$                   -1, plot  negative part  of function.   Only
 C$                   the sign of S is used.
 C$    B..............(ATAN2 cut line does not fall in quadrant
 C$                   being graphed).
 C$    O(3,3).........Orthogonal rotation matrix.
 C$    PL2............2-D pen movement subroutine.
 C$    (09-APR-82)