<th>tox1</th>
      <td><p>Toxicity probability permitted when efficacy is guaranteed;
a number between 0 and 1 (see Details).</p></td>
    </tr>
    <tr>
      <th>eff_star</th>
      <td><p>Efficacy probability of an equi-utility third point (see
Details).</p></td>
    </tr>
    <tr>
      <th>tox_star</th>
      <td><p>Toxicity probability of an equi-utility third point (see
Details).</p></td>
    </tr>
    <tr>
      <th>priors</th>
      <td><p>instance of class <code><a href='efftox_priors.html'>effto