pan class="w"> </span><span class="n">ti</span>

<span class="w">   </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">xi</span><span class="w"> </span><span class="p">.</span><span class="n">eq</span><span class="p">.</span><span class="w"> </span><span class="mf">0.0d0</span><span class="p">)</span><span class="w"> </span><span class="k">then</span>
<span class="k">      </span><span class="n">yr</span><span class="w"> </span><span class="o">=</span><span class