anchor.diff:                  .attr("width", w * #{chanFreqLen} - 1)
                   .attr("height", h + xlab);
   
  +            chart.selectAll(".yTicks")
  +                .data(y.ticks(4).slice(0,5))
  +                .enter().append("svg:line")
  +                .attr("class", "yTicks")
  +                .attr("y1", function(d) { return y(d); })
  +                .attr("x1", 0)
  +                .attr("y2", function(d) { return y(d); })
  +                .attr("x2", w * #{chanFreqLen})
  +
               chart.selectAll("rect")
                   .data([#{chanFreq}])
                 .enter().append("rect")
  
positive.code:                 .attr("width", w)
                  .attr("height", function(d) { return y(d); })
                  .attr("title", function(d){ return d; });
  
              chart.append("line")
                .attr("x1", 0)
  
negative.code:       .chart rect:hover {
            fill: #000;
        }
        .yTicks {
          stroke: #aaa;
          stroke-width: 0.5;
        }
  
      script
          $(document).ready(function(){
              // d3.js Graph
              var xlab = 30;
              var chartw = 940;
              var w = 5.595;
              var h = 120;
  
  