code: def removeAboveValue(requestContext, seriesList, n):
      
      for s in seriesList:
          s.name = 'removeAboveValue(%s, %g)' % (s.name, n)
          s.pathExpression = s.name
          for (index, val) in enumerate(s):
              if val is None:
                  continue
              if val > n:
                  s[index] = None
  
      return seriesList
docs: Removes data above the given threshold from the series or list of series
      provided. Values above this threshold are assigned a value of None.