>
    <span class="n">merger_rate_density</span><span class="o">=</span><span class="s2">&quot;sfr_madau_dickinson2014&quot;</span><span class="p">,</span>
    <span class="n">merger_rate_density_param</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">af</span><span class="o">=</span><span class="mf">2.7</span><span class="p">,</span> <span class="n">bf</span><span class="o">=</span><span class="mf">5.6</span><span class="p">,</span> <span class="n">cf</span><