On highcharts drilldown, how to know which column that have been clicked - highcharts

On highcharts column drilldown, how to know which column that have been clicked?

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Please go through this js fiddle:
<code> http://jsfiddle.net/54v04uxc/10/ </code>
I am not getting the issue that is causing the display of default data in navigation chart instead of my custom series with my own data attribute
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