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UTRS3

       SUBROUTINE  UTRS3 (XMIN,XMAX, N, XMINP,XMAXP, DIST)
 C$    (Define Logarithmic Scale Limits - Variable Interval)
 C$    Given estimated maximum and minimum values and a number  of
 C$    logarithmic intervals, adjust the extrema to encompass  the
 C$    desired number  of intervals,  such  that they  are  "nice"
 C$    values for a plot.
 C$
 C$    The input arguments are:
 C$
 C$    XMIN.......Approximate minimum value.
 C$    XMAX.......Approximate maximum value.
 C$    N..........Approximate number of data intervals required.
 C$
 C$    The output arguments are:
 C$
 C$    XMINP......Adjusted minimum value.
 C$    XMAXP......Adjusted maximum value.
 C$    DIST.......Ratio between adjacent uniformly spaced
 C$               intervals.
 C$
 C$    XMIN, XMAX, and N are not modified.
 C$
 C$    VINT(*) is an array of acceptable vales for DIST (times  an
 C$    integer power of 10).
 C$
 C$    Author:  C.R. Lewart, Comm. ACM.  Algorithm 463 (1972).
 C$
 C$    (30-JAN-82)