Highcharts - Referance a separate data series in a series tooltip -

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my desired functionality can seen @ link below. however, in case i'm using external csv file series' in it. when using external file, code doesn't have same functionality. (no tooltip appears on series 0 & 1)

is there change can make code work external csv's?

desired functionality: http://jsfiddle.net/uwbur/1/

        tooltip:{             formatter:function(){                 var key = this.key;                 if(this.series.index < 1){                     return 'series 0 '+ this.y + '<br/>series 1 '+this.series.chart.series[1].data[key].y;                 }                 else{                     return 'other series' + this.y;                 }             }         },


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