span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">sample</span><span class="w"> </span><span class="nb">min</span><span class="w"> </span><span class="o">+</span>
<span class="n">xdel</span><span class="p">;</span><span class="w"> </span><span class="n">the</span><span class="w"> </span><span class="n">second</span><span class="w"> </span><span class="k">class</span><span class="w"> </span><span class="n">interval</span><span class="w"> </span><span class="k">is</span>