o">=</span><span class="n">z_min</span><span class="p">,</span>
        <span class="n">z_max</span><span class="o">=</span><span class="n">z_max</span><span class="p">,</span>
        <span class="n">merger_rate_density</span><span class="o">=</span><span class="s2">&quot;merger_rate_density_bbh_primordial_ken2022&quot;</span><span class="p">)</span>

<span class="c1"># source frame</span>
<span class="n">rate4_src</span> <span class="o">=</span> <span class="n">cbc</span><span class="o">.</span><span clas