code: def value(self):
      
      if not self.is_value_set:
        raise MeasurementNotSetError('Measurement not yet set', self.name)
      return [dimensions + (value,) for dimensions, value in
              six.iteritems(self.value_dict)]
docs: The values stored in this record.
  
      Returns:
        A list of tuples; the last element of each tuple will be the measured
        value, the other elements will be the associated coordinates.  The tuples
        are output in the order in which they were set.