min_length = length_range.lower()
        max_length = length_range.upper()
        if self._max_distance:
            max_length = self._max_distance
        assert min_length is not None
        assert max_length is not None
        ring_distance = self._determine_ring_distance(max_length)
        if ring_distance is None:
            return
        distance = ring_distance
        while distance < max_length:
            radius = radius_range.interpolate((distance / max_length).magnitude)