90th-percentile brightness vs 90th-percentile precipitating energy flux based on downward JEDI electrons (25-1000 keV) observed by Juno during crossings of arc-like (blue) and blob-like (red) features in the outer emission. Error bars denote the 80th-100th percentile range. The best-fit linear relation is given by a solid black line, as well as separate best-fit relations for the arc-like (dashed) and blob-like (dash-dotted) features. The theoretical relation after Gérard et al. (2016) is given by the dotted grey line.