_par[i]</code>.  Column i of <code>prof_loglik_vals</code>
      contains the corresponding values of the profile loglikelihood.</p></dd>

    <dt>sym_CI, prof_CI</dt>
<dd><p><code>length(which_pars)</code>
      by 2 numeric matrices.  Row i of <code>sym_CI</code> (<code>prof_CI</code>)
      contains the symmetric (profile loglikelihood-based) confidence
      intervals for parameter <code>which_pars[i]</code>.</p></dd>
</dl><p>If a value in</p>
<p></p>
<p><code>prof_CI</code> is <code>NA</code> then this