title: highcharts - changing color of area depending on y-value
body: <p>How can I change the color of an area type plot depending on y-values which are in same series ?</p>
  
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  <p>type of chart - area</p>
  
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  <p>y- values possible - 1, 2 and 3</p>
  
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  <p>desired output - Green color area for values between 3 &amp; 2, red color area for values between 2 &amp; 1</p>