function d3_selection_enter(selection) {
  d3_arraySubclass(selection, d3_selection_enterPrototype);
  return selection;
}

var d3_selection_enterPrototype = [];

d3_selection_enterPrototype.append = d3_selectionPrototype.append;
d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
d3_selection_enterPrototype.node = d3_selectionPrototype.node;