</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">10</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">y1</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">-10</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">y2</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">10</span></span></em>,