span><span class="p">,</span> <span class="s1">&#39;high&#39;</span><span class="p">:</span> <span class="mf">1.4</span><span class="p">}</span>
    <span class="n">_S</span> <span class="o">=</span> <span class="mi">15</span>
    <span class="n">_B</span> <span class="o">=</span> <span class="mi">70</span>
    <span class="n">_TAU</span> <span class="o">=</span> <span class="mi">1</span>

    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span>
        <span class="bp">self</