span><span class="n">FIELDS</span><span class="p">),</span> <span class="k">INTENT</span><span class="p">(</span><span class="n">IN</span><span class="p">)</span>       <span class="kd">::</span> <span class="n">F</span>
    <span class="c">!! An instance of the KORC derived type FIELDS.</span>

    <span class="k">if</span> <span class="p">(</span><span class="n">params</span><span class="p">%</span><span class="n">orbit_model</span><span class="p">(</span><span class="mi">1</span><span class="p">:</span><