code: def _get_separated_values(self, secondary=False):
          
          series = self.secondary_series if secondary else self.series
          positive_vals = map(
              sum,
              zip(
                  *[
                      serie.safe_values for index, serie in enumerate(series)
                      if index % 2
                  ]
              )
          )
          negative_vals = map(
              sum,
              zip(
                  *[
                      serie.safe_values for index, serie in enumerate(series)
                      if not index % 2
                  ]
              )
          )
          return list(positive_vals), list(negative_vals)
docs: Separate values between odd and even series stacked