docs: def FilterRange(self, start_time=None, stop_time=None):
      """Filter the series to lie between start_time and stop_time.
  
      Removes all values of the series which are outside of some time range.
  
      Args:
        start_time: If set, timestamps before start_time will be dropped.
        stop_time: If set, timestamps at or past stop_time will be dropped.
      """
  
      start_time = self._NormalizeTime(start_time)
      stop_time = self._NormalizeTime(stop_time)
      self.data = [
          p for p in self.data
          if (start_time is None or p[1] >= start_time) and
          (stop_time is None or p[1] < stop_time)
      ]