just another inlet to tributary

inlet.js

var margin = 50,
    width = 700,
    height = 442;
trib.r = 8.241758241758248;
d3.json('/static/bus_perf.json', draw);

function draw(data){
 
  d3.select("svg")
    .attr("width", width)
    .attr("height", height)
    .selectAll("circle")
    .data(data)
    .enter()
    .append("circle");
  
  x_extent = d3.extent(data, function(d){return d.collision_with_injury});
  var x_scale = d3.scale.linear()
      .range([margin,width-margin])
      .domain(x_extent);
  
  y_extent = d3.extent(data, function(d){return d.dist_between_fail});
  var y_scale = d3.scale.linear()
      .range([height-margin, margin])
      .domain(y_extent);
  
  d3.selectAll("circle")
    .attr("cx", function(d){return x_scale(d.collision_with_injury)})
    .attr("cy", function(d){return y_scale(d.dist_between_fail)});
  
  d3.selectAll("circle")
    .attr("r",trib.r); 
  
  var x_axis = d3.svg.axis().scale(x_scale);
  
  d3.select("svg")
    .append("g")
    	.attr("class", "x axis")
	    .attr("transform", "translate(0," + (height-margin) + ")")
    .call(x_axis);
}