anchor.diff:      .attr("y", 6)
       .attr("dy", ".71em")
       .style("text-anchor", "end")
  -    .text("Temperature (ºF)");
  +    .text("height (ft)");
   
   // optional image insert inside svg example:
   svg.selectAll("image").data([0])
  
positive.code: 
  var margin = {top: 20, right: 20, bottom: 30, left: 30},
      width = 660 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom;
  
  var parseDate = d3.time.format("%Y%m%d").parse;
  
  var x = d3.time.scale()
      .range([0, width]);
  
  var y = d3.scale.linear()
  
negative.code:     .scale(y)
      .orient("left");
  
  //Drawing curves
  
  var set = [];
  
    for (i=0; i < 100; i++) {
      for (j=0; j < 2; j++) {
        set.push({i, j});
      }
    } 
  
  console.log(JSON.stringify(set));
  
  var line = d3.svg.line()
      .x(function(d) { drawGraph;})
      .y(function(d) { drawGraph; })
      .interpolate("cardinal");
  
  var svg = d3.select("#vis").append("svg")
  