return bar markers rendering

src/common/utilities.js

@@ -163,7 +163,7 @@ export function calcOpacity (num) {
    * other events there are in the same render. The idea here is that the
    * overlaying of events builds up a 'heat map' of the event space, where
    * darker areas represent more events with proportion */
-  const base = num >= 1 ? 0.6 : 0
+  const base = num >= 1 ? 0.3 : 0
   return base + (Math.min(0.5, 0.08 * (num - 1)))
 }