ntegrals, and reports the results.
    </p>

    <p>
      The quadrature rule is defined by three text files:
      <ol>
        <li>
          <i>the "X" file</i> lists the abscissas (N rows, M columns);
        </li>
        <li>
          <i>the "W" file</i> lists the weights (N rows);
        </li>
        <li>
          <i>the "R" file</i> lists the integration region corners
          (2 rows, M columns);
        </li>
      </ol>
      For more on quadrature rules, see the <b>QUADRATURE_RULES</b>
  