def _final_data(self):
        """
        Returns
        -------
        A list of tuples representing rows from the datatable's index
        and final column, sorted accordingly.
        """
        dtbl = self.datatable

        objs = object_session(self)
        if isinstance(dtbl, Table):
            return objs.query(dtbl.c.indx, dtbl.c.final).all()
        else:
            raise Exception("Symbol has no datatable, likely need to cache first.")