<li><p><code>data</code> <em><code>x_r</code></em>: real data, type <code>real[]</code>, data only, and</p></li>
<li><p><code>data</code> <em><code>x_i</code></em>: integer data, type <code>int[]</code>, data only.</p></li>
</ul>
<p>For more fine-grained control of the ODE solvers, these parameters can
also be provided:</p>
<ul>
<li><p><code>data</code> <em><code>rel_tol</code></em>: relative tolerance for the ODE solver, type
<code>real</code>, data only,</p></li>
<li><p><code>data</code> <em><code>abs_tol