text: var svg = d3.select("svg"),
      margin = {top: 20, right: 20, bottom: 30, left: 40},
      width = +svg.attr("width") - margin.left - margin.right,
      height = +svg.attr("height") - margin.top - margin.bottom;
  
  var x = d3.scaleBand().rangeRound([0, width]).padding(0.1),
      y = d3.scaleLinear().rangeRound([height, 0]);
  
  var g = svg.append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
  // explanation of async:
  // d3.tsv("filelocation/filename.tsv",streamParse(data_piece),callback(error,data))
  
  d3.tsv("data.tsv", function(d) {
    d.frequency = +d.frequency;
    return d;
  }, function(error, data) {
    if (error) throw error;
  
    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); })
        .on('click',function(d,i){
          console.log(this)
        });
    //bindEvents()
  });