 history bullets to make the failed bullet stand out.
	 * History bullets will appear when we zoom in.
	 */
	/*hist.set("minBulletDistance", 1);*/

	/* Create column series for the single succeeded commit bar chart */
	if (succeeded_build) {
	    var succeeded_url = jenkins_job_url + succeeded_build + "/console";
	    green  = series(succeeded,    /* JSON data                          */
			    "date",       /* JSON key for valueXField           */
			    "stat.total", /* JSON key for valueYField           