Index: node_modules/d3-selection/src/selection/lower.js
===================================================================
--- node_modules/d3-selection/src/selection/lower.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
+++ node_modules/d3-selection/src/selection/lower.js	(revision e4c61dd6cd86e06265bc2bd91adba84a0f04044a)
@@ -0,0 +1,7 @@
+function lower() {
+  if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
+}
+
+export default function() {
+  return this.each(lower);
+}