anchor.diff:  
   var chart = d3.select("#top-repos")
     .append("g")
  -    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  +  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
   
   var repo_groups = chart.selectAll("g")
     .data(repos)
  
positive.code:     var h = d.score;
      // breakdown
      t.selectAll(".contributor")
        .attr("transform", "translate(0,"+y(h)+")");
      t.selectAll(".contributor-bar")
        .attr("height", 0);
      // label
  
negative.code: contributor_groups
    .append("text")
    .attr("class", "contributor-name")
    .attr("x", x.rangeBand() / 2)
    .attr("y", "1em")
    .text(function(d) { return d.github_name; });
  
  