def _exclusion_indices_for_range(self, start_idx, end_idx):
        """
        Returns
        -------
        List of tuples of (start, stop) which represent the ranges of minutes
        which should be excluded when a market minute window is requested.
        """
        itree = self._minute_exclusion_tree
        if itree.overlaps(start_idx, end_idx):
            ranges = []
            intervals = itree[start_idx:end_idx]
            for interval in intervals:
                ranges.append(interval.data)
            return sorted(ranges)
        else:
            return None