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      Return the significance of the Kuiper statistic


      Returns the significance level of an observed value of the
      Kuiper statistic D for an effective number of data points
      N_eff. Called by KUIPERONE

Calling Sequence

      prob_kuiper, D, N_eff, probks
      D - Kuiper statistic, floating scalar, always non-negative
      N_eff - Effective number of data points, scalar. For a 2 sided test
              this is given by (N1*N2)/(N1+N2) where N1 and N2 are the number
              of points in each data set.

Output Parameters

      probks - floating scalar between 0 and 1 giving the significance level of
              the Kuiper statistic. Small values of PROB suggest that the
              distribution being tested are not the same

Revision History

      Written W. Landsman August, 1992
      Corrected typo (termbv for termbf) H. Ebeling/W.Landsman March 1996
      Probably did not affect numeric result, but iteration went longer
      than necessary
      Converted to IDL V5.0 W. Landsman September 1997
      Adapted from PROB_KS J. Ballet July 2003

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