xAxis property
        
        dynamic
        xAxis
        
      
getter/setter pair
      When using dual or multiple x axes, this number defines which xAxis the particular series is connected to. It refers to either the axis id or the index of the axis in the xAxis array, with 0 being the first.
API Docs: https://api.highcharts.com/highcharts/series.columnrange.xAxis
Implementation
dynamic xAxis;