>ymax0</span><span class="w"></span>
<span class="kt">real</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">z</span><span class="w"></span>
<span class="kt">real</span><span class="w"> </span><span class="kd">::</span><span class="w"> </span><span class="n">zom</span><span class="w"></span>

<span class="w">   </span><span class="n">z</span><span class="o">=</span><span class="n">zom</span><span class="w"></span>
<span class="w">   </span><span class="n">xmax</