docs: def relfreq(inlist, numbins=10, defaultreallimits=None):
      """
  Returns a relative frequency histogram, using the histogram function.
  
  Usage:   lrelfreq(inlist,numbins=10,defaultreallimits=None)
  Returns: list of cumfreq bin values, lowerreallimit, binsize, extrapoints
  """
      h, l, b, e = histogram(inlist, numbins, defaultreallimits)
      for i in range(len(h)):
          h[i] = h[i] / float(len(inlist))
      return h, l, b, e