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VISLI

       REAL FUNCTION  VISLI (Z,X,Y,I)
 C$    (Linear Interpolation)
 C$    Perform the backward linear interpolations required by  the
 C$    horizon routines.  The arguments are:
 C$
 C$    Z..............Point at which interpolation is made.
 C$    X(*)...........Array in which Z is interpolated
 C$    Y(*)...........Array from which to take the interpolated
 C$                   value .
 C$    I..............An index for which X(I-1) .LE. Z .LE. X(I)
 C$    (07-MAY-89)