text: var Bar = function(element, data) {
  	var elementMeasurements = element.getBoundingClientRect();
  	var margin = {top: 20, right: 20, bottom: 30, left: 40},
  	width = elementMeasurements.width - margin.left - margin.right,
  	height = elementMeasurements.height - margin.top - margin.bottom;
  
  	var x = d3.scaleBand().rangeRound([0, width]).padding(0.1);
  	var y = d3.scaleLinear().rangeRound([height, 0]);
  
  	var svg = d3.select(element).append("svg")
  		.attr("width", elementMeasurements.width - 6)
  		.attr("height", elementMeasurements.height - 6);
  
  	var g = svg.append("g")
  		.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
  	x.domain(data.map(function(d) { return d.letter; }));
  	y.domain([0, d3.max(data, function(d) { return d.frequency; })]);
  
  	g.append("g")
  		.attr("class", "axis axis--x")
  		.attr("transform", "translate(0," + height + ")")
  		.call(d3.axisBottom(x));
  
  	g.append("g")
  		.attr("class", "axis axis--y")
  		.call(d3.axisLeft(y).ticks(10, "%"))
  		.append("text")
  		.attr("transform", "rotate(-90)")
  		.attr("y", 6)
  		.attr("dy", "0.71em")
  		.attr("text-anchor", "end")
  		.text("Frequency");
  
  	g.selectAll(".bar")
  		.data(data)
  		.enter().append("rect")
  		.attr("class", "bar")
  		.attr("x", function(d) { return x(d.letter); })
  		.attr("y", function(d) { return y(d.frequency); })
  		.attr("width", x.bandwidth())
  		.attr("height", function(d) { return height - y(d.frequency); });
  };
  
  charts.bar = {
  	render: Bar,
  	type: 'bar',
  	name: 'Bar'
  };