function to get the line of the "line chart"?

 

Is there a fucntion that exists that I can use to get the current point on the line charts "line"? I've tried Close[0] but that failed, just need a function to get the points on that line...

Thanks,

Daum

 
Close[0] get point of first bar, Close[i] get value of i-th bar.
Reason: