How to add units to Highcharts/Highmaps's last legend/coloraxis? -

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i'd add units legend/coloraxis of heatmap. work piece of code:

    coloraxis:      {         stops: [         [0, '#c4463a'],         [0.7, '#fffbbc'],         [1, '#3060cf']         ],         labels:          {             formatter: function ()              {                 return this.value + "km2";             }         }     }

but put me "km2" @ each of numbers in legend/coloraxis. however, not sufficient, surely more clean, put once, @ end of last number. legend read:

-4000, -2000, 0, 2000 km2

is possible within highcharts/highmaps put unit @ last coloraxis lable? otherwise, need put text item there specifying x/y coordinates, no?

here fiddle.

thanks hints.

use following code :

 labels: {             formatter: function () {                if(this.islast)                 return this.value+"km2";                 else                      return this.value;             }         }

here is updated fiddle


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