D3 multi line chart mouseover

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I am using the mouseover technique mentioned in this link:

<a href="http://jsfiddle.net/takuan/gakdeL1u/7/">http://jsfiddle.net/takuan/gakdeL1u/7/</a>

Here, the mouseover is working simultaneously for both the charts. I want it to work for only one chart at a time i.e. show the mouseover for the chart on which the mouse is. Could it be done with the same set of code?