span class="o">=</span><span class="s1">&#39;upper right&#39;</span><span class="p">,</span> <span class="n">fontsize</span><span class="o">=</span><span class="n">TextSize</span><span class="p">)</span>
        <span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
    <span class="k">return</span> <span class="n">tau</span> <span class="o">-</span> <span class="mi">1</span></div>



<span class="c1"># In[ ]:</span>


<span class="k">if</span> <span class="vm