hlight-none notranslate"><div class="highlight"><pre><span></span>[20]:
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<div class="input_area highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># normalization factor is different</span>
<span class="c1"># plot the merger rate density (source frame)</span>
<span class="c1"># factor 1e9 is to convert to Gpc^-3 yr^-1 from Mpc^-3 yr^-1</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span 