display values lower than a certain value appear different from the rest of the graphic for map - Javascript highmap

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Description

display values lower than a certain value appear different from the rest of the graphic for map

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Highcharts Demo</title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <script type="text/javascript" src="https://code.jquery.com/jquery-1.9.1.js"></script> 
      <script type="text/javascript">
$(function () {/*ww w .j av a 2s. c  o  m*/
    $.getJSON('https://www.highcharts.com/samples/data/jsonp.php?filename=us-population-density.json&callback=?', function (data) {
        $.each(data, function () {
            this.code = this.code.toUpperCase();
        });
        $('#container').highcharts('Map', {
            chart: {
                borderWidth: 1
            },
            title: {
                text: 'US population density (/km?)'
            },
            legend: {
                layout: 'horizontal',
                borderWidth: 0,
                backgroundColor: 'rgba(255,255,255,0.85)',
                floating: true,
                verticalAlign: 'top',
                y: 25
            },
            mapNavigation: {
                enabled: true
            },
            colorAxis: {
                min: 10,
                type: 'logarithmic',
                minColor: '#EEEEFF',
                maxColor: '#000022',
                stops: [
                    [0, '#ff0000'],
                    [1e-8, '#ff0000'],
                    [1e-7, '#EFEFFF'],
                    [0.67, '#4444FF'],
                    [1, '#000022']
                ]
            },
            series: [{
                animation: {
                    duration: 1000
                },
                data: data,
                mapData: Highcharts.maps['countries/us/us-all'],
                joinBy: ['postal-code', 'code'],
                dataLabels: {
                    enabled: true,
                    color: 'white',
                    format: '{point.code}'
                },
                name: 'Population density',
                tooltip: {
                    pointFormat: '{point.code}: {point.value}/km?'
                }
            }]
        });
    });
});

      </script> 
   </head> 
   <body> 
      <script src="https://code.highcharts.com/maps/highmaps.js"></script> 
      <script src="https://code.highcharts.com/maps/modules/data.js"></script> 
      <script src="https://code.highcharts.com/mapdata/countries/us/us-all.js"></script> 
      <div id="container" style="height: 500px; min-width: 310px; max-width: 600px; margin: 0 auto"></div>  
   </body>
</html>

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