score:1

Accepted answer

You can do it by using this: xAxis.type: 'category'
Pseudo code below:

xAxis: {
  type: 'category',
},
series: [
    {
      data: [{ name:'Nominal Bonds 1',y:5 }, { name:'Nominal Bonds 2',y:23}]
    },

    {
     data: [{ name:'Inflation 1',y:15 }, { name:'Inflation 2',y:12}, { name:'Inflation 3',y:22}]
    },

    {
    data: [{ name:'Equity 1',y:35}, { name:'Equity 2',y:21 }, { name:'Equity 3',y:52 }, { name:'Equity 4',y:31}]
    }
]

Demo: https://jsfiddle.net/BlackLabel/q97vxzct/


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