fill: boundary
					}]
				},
				options: Chart.helpers.merge(options, {
					title: {
						text: 'fill: ' + boundary,
						display: true
					}
				})
			});
		});


		function toggleSmooth(btn) {
			var value = btn.classList.toggle('btn-on');
			Chart.helpers.each(Chart.instances, function(chart) {
				chart.options.elements.line.tension = value? 0.4 : 0.000001;
				chart.update();
			});
		}

		function randomize() {
			var seed = utils.rand();
			Chart.helpers.each(Chart.instances, function(chart) {
