trahedron_nco_order_num.m">tetrahedron_nco_order_num.m</a>
          returns the order of a given NCO rule for the tetrahedron.
        </li>
        <li>
          <a href = "tetrahedron_nco_rule.m">tetrahedron_nco_rule.m</a>
          returns the points and weights of an NCO rule.
        </li>
        <li>
          <a href = "tetrahedron_nco_rule_num.m">tetrahedron_nco_rule_num.m</a>
          returns the number of NCO rules available.
        </li>
        <li>
          <a href = "tetrahedron_nco_subo