r.txt">
          leg_o4_r.txt</a>,
          defines the region for the rule.
        </li>
        <li>
          <a href = "../../datasets/quadrature_rules_legendre/leg_o4_exact.txt">leg_o4_exact.txt</a>,
          the results of the command 
          <blockquote><b>
            legendre_exactness ( 'leg_o4', 10 )
          </b></blockquote>
        </li>
      </ul>
    </p>

    <p>
      <b>LEG_O8</b> is a standard Gauss-Legendre order 8 rule.
      <ul>
        <li>
          <a href = "../../datase