(function () {

    "use strict";

    angular.module("d3ServiceModule", [])
           .factory("d3Service", [function () {
               var myD3 = d3;

               // No globals allowed. D3 is only usable through this service.
               d3 = undefined;

               if (myD3 === undefined)
                   throw new Error("d3 service is undefined.");

               return myD3;
           }]);

}());