ATR with custom input dataseries

[stormze]

I have a simple question.
As described here: http://stockcharts.com/school/doku.p...true_range_atr
The ATR indicator uses various dataseries as input (High, Low, Close, etc)

What I want to do is to construct an ATR with custom input dataseries but I only just found a contructor that receive only one IDataSeries as input...
From documentation this is the only two ways to contruct an ATR

ATR(int period)
ATR(IDataSeries inputData, int period)

Im assuming the first one uses the default series High, Low, Close... but what it does the second one ???