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VISLI2

       REAL FUNCTION  VISLI2 (XINT, X, Y, I, N)
 C$    (Linear Interpolation)
 C$    Perform the backward linear interpolations required by  the
 C$    horizon routines.  Extrapolation  is used  if necessary  at
 C$    the endpoints.  The arguments are:
 C$
 C$    XINT..........Point at which interpolation is made.
 C$    X(*)..........Array in which XINT is interpolated.
 C$    Y(*)..........Array from which to take the interpolated
 C$                  value.
 C$    I.............An index for which X(I-1) .LE. XINT .LE. X(I)
 C$                  (except possibly at endpoints, I = 1 or I = N)
 C$    N.............Dimension of X(*) and Y(*).
 C$
 C$    (20-JUL-89)