Index: arms/js/analysisScope.js
===================================================================
diff -u -r2469c1dfd799eb6a9b0d55ef24126a0b4a5b5291 -r7126b6cdb8e5fd2acfbb46eeb06f0919e19e8b1c
--- arms/js/analysisScope.js	(.../analysisScope.js)	(revision 2469c1dfd799eb6a9b0d55ef24126a0b4a5b5291)
+++ arms/js/analysisScope.js	(.../analysisScope.js)	(revision 7126b6cdb8e5fd2acfbb46eeb06f0919e19e8b1c)
@@ -1186,6 +1186,13 @@
 		.join("path")
 		.attr("d", ribbon)
 		.attr("fill", (d) => colors[d.target.index])
+		.attr("opacity", 0.6)
+		.on("mouseenter", function (d) {
+			d3.select(this).transition().attr("opacity", 1);
+		})
+		.on("mouseout", function () {
+			d3.select(this).transition().attr("opacity", 0.6);
+		})
 		.attr("stroke", "white")
 		.append("title")
 		.text(