pan> <span class="o">*</span> <span class="mi">60</span> <span class="o">*</span> <span class="mi">24</span><span class="p">)</span>  <span class="c1"># in days</span>
    <span class="n">dmu</span> <span class="o">=</span> <span class="nb">abs</span><span class="p">(</span><span class="n">mu</span><span class="p">[</span><span class="n">idx1</span><span class="p">]</span><span class="o">/</span><span class="n">mu</span><span class="p">[</span><span class="n">idx2</span><span class="p">])</span><span class=