function speedSeries(response) {
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						|
								
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								  var data = response.linestring;
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								  var system = {
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								    label: 'mph',
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								    multiplier: 2.23694
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								  };
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						|
								  
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								  if(document.getElementById('is-metric').value == true) {
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								    system.label = 'km/h';
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								    system.multiplier = 3.6;
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								  }
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						|
								
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								  var series = {
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								    name: "Speed",
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								    yAxis: 1,
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								    tooltip: {
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								      animation: true,
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								      pointFormatter: function(){
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								        moveMarkerToPosition(this);
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								        return '<b>'+this.y+system.label+'</b>';
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								      }
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								    },
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								    lineWidth: 1,
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								    color: '#a8a8a8',
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								    marker: {
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								      enabled: true,
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								      radius: 1,
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								      symbol: 'circle',
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								      fillColor: '#a8a8a8'
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								    },
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								    turboThreshold: 0,
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								    data: []
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						|
								  };
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						|
								
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								  series.data = data.properties.map(function(d,i){
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								    return {
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								      x: new Date(d.unixtime*1000),
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								      y: ('speed' in d && d.speed >= 0 ? Math.round(d.speed * system.multiplier) : null), 
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								      location: data.coordinates[i]
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								    }
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						|
								  });
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						|
								
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								  return [series];
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						|
								}
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