D3 Examples - Contour Test using Jason Davis implementation with D3

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<html>
  <head>
    <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@2.10.3/d3.v2.js"></script>
    <script type="text/javascript" src="https://paulbourke.net/papers/conrec/conrec.js"></script>
    <script type="text/javascript" src="multiplot.js"></script>
  </head>
  <body>
    <script type="text/javascript">
        var c = new Conrec(),
            xs = d3.range(0, data[0].length),
            ys = d3.range(0, data.length),
            zs = d3.range(-5, 3, .5),
            w = 500, h = 500,
            x=d3.scale.linear().range([0,w]).domain([0,data[0].length]),
            y=d3.scale.linear().range([0,h]).domain([0,data.length]),
            colours = d3.scale.linear().domain([-5, 3]).range(["#fff", "red"]);
            
        c.contour(data, 0, xs.length-1, 0, ys.length-1, xs, ys, zs.length, zs);
        
        svg=d3.select("body").append("svg:svg")
            .attr("width",w)
            .attr("height",h)
            
        svg.selectAll("g")
            .data(d3.nest().key(function(d) { return d.level}).entries(c.contourList()))
            .enter()
            .append("svg:g")
                .attr("class",function(d) { return "level_"+d.key})
                .style("fill",function(d) { console.log(d);return colours(d.key);})
                .style("stroke","black")
                .style("opacity",0.5)
                .selectAll("path")
                    .data(function(d) { return d.values})
                    .enter()
          
                    .append("svg:path")
                        .attr("d",d3.svg.line()
                            .x(function(d) { return x(d.x)})
                            .y(function(d) { return y(d.y)})
                            )
    </script>
  </body>
</html>
    