/span></em>, <em class="sig-param"><span class="n"><span class="pre">d2</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">method</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">'mc'</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">onfirst</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">False</span></span></em><span class="sig-paren">)</s