score:1

You can set max value on colorAxis

colorAxis: {
        min: 0,
        max:50
},

or use tickPositioner and calculate as you need.

colorAxis: {
            min: 0,
            tickPositioner:function(){
                    console.log(this);
            }
},

Docs: http://api.highcharts.com/highmaps#colorAxis


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