pan class="special">,</span> <span class="identifier">radius</span><span class="special">),</span> <span class="identifier">guess</span><span class="special">,</span> <span class="identifier">factor</span><span class="special">,</span> <span class="identifier">is_rising</span><span class="special">,</span> <span class="identifier">tol</span><span class="special">,</span> <span class="identifier">it</span><span class="special">);</span>
   <span class="comment">// Result is midway between the endpoints of th