Log-likelihood ﹩\mathrm{log}{ \mathcal L }﹩ normalized by ﹩{{ \mathcal L }}_{\max }﹩, marginalized over both ﹩{R}_{0}^{\min }﹩ and ﹩{R}_{0}^{\max }﹩. This is shown for both the standard set of assumptions for all FRBs (thick black line), and a range of different assumptions about the properties of FRB 171019: its burst shape (blue thin solid line), spectral index α (red dashed line), time clustering k (green dotted–dashed line), and redshift (orange dotted line), with confidence intervals as indicated.