Well actually jgunter there was a 4% swing overnight..When we...

Well actually jgunter there was a 4% swing overnight..
When we closed yesterday the DOW futures were indicating a 2% rise.
When the DOW futures dropped back to indicate a flat open, the SPI was down 2.7% or something just above 4000, after the DOW rose 4% the SPI indicated a 1.5% rise or so.. ~4.2%

We diverge a little generally Monday's/Fridays, but after that we pretty much track the DOW move for move, albeit the XJO is a lower beta index if you use say the DOW as reference, generally because their intraday swings only equate to movements in the SPI for us and by the time we open we already know where to go.