anchor.diff:        brush.x(x);
         return chart;
       };
  -
       chart.y = function(_) {
         if (!arguments.length) return y;
         y = _;
         return chart;
       };
  -
       chart.dimension = function(_) {
         if (!arguments.length) return dimension;
         dimension = _;
         return chart;
       };
  -
       chart.filter = function(_) {
         if (_) {
           brush.extent(_);
  
positive.code: <!-- charts START -->
    <div id="charts">
  
      <div id="speed-chart" class="chart"><div class="title">Size (meters)&nbsp;&nbsp;|&nbsp;&nbsp; <div href="#" class="label label-info" data-toggle="popover" data-placement="above" title="Size (meters)" data-content="Approximate dimension of asteroids">&nbsp;<span class="fa fa-info-circle fa-lg"></span>&nbsp;</div></div></div>
  
      <div id="size-chart" class="chart"><div class="title">Next Close Approach Distance (LD)&nbsp;&nbsp;|&nbsp;&nbsp;<div href="#" class="label label-info" data-toggle="popover" data-placement="above" title="Next Close Approach Distance (LD)" data-content="LD stands for Lunar Distance. How close the asteroid will come on its next flyby of Earth (1 LD = 384,401 km)">&nbsp;<span class="fa fa-info-circle fa-lg"></span>&nbsp;</div></div></div>
  
      <div id="perihelion-distance-chart" class="chart"><div class="title">Orbital Period (years)&nbsp;&nbsp;|&nbsp;&nbsp;<div href="#" class="label label-info" data-toggle="popover" data-placement="above" title="Orbital Period (years)" data-content="How long it takes the asteroid to complete one trip around the Sun">&nbsp;<span class="fa fa-info-circle fa-lg">&nbsp;</span></div></div></div>
  
      <div id="earth-moid-chart" class="chart"><div class="title">&#916;v (km/s)&nbsp;&nbsp;|&nbsp;&nbsp;<div href="#" class="label label-info" data-toggle="popover" data-placement="above" title="&#916;v (km/s)" data-content="Approximate change in speed required to reach the asteroid; the more speed required, the harder it is to get to it.">&nbsp;<span class="fa fa-info-circle fa-lg">&nbsp;</span></div></div></div>
  
    </div>
  <!-- charts END -->
  
negative.code:   <script type="text/javascript" async="" src="../../../mpc/js/plusone.js"></script>
    <script type="text/javascript" async="" src="../../../mpc/js/ga.js"></script>
  
    <
    <link href="../../../mpc/css/css.css" rel="stylesheet" type="text/css">
  <!-- END MPC -->
  
  