</span>: redshift of source * <span class="math notranslate nohighlight">\(\mathcal{R}_O\)</span>: local merger rate density. <span class="math notranslate nohighlight">\(\mathcal{R}_O=23.9^{+14.3}_{-8.6}\text{Gpc}^{-3}\text{yr}^{-1}=23.9^{+14.3}_{-8.6} \times 10^{-9}\text{Mpc}^{-3}\text{yr}^{-1}\)</span> * fitting parameters: <span class="math notranslate nohighlight">\(b_2=1.6\)</span>, <span class="math notranslate nohighlight">\(b_3=2.1\)</span>, <span class="math notranslate nohighlight">\(b_4=30\)</sp