Now, when you say you have a system, you mean your own program? or a feature of IQFEED?
My own program built on top of IQFeed.
For the sake of clarity, here is a typical historical tick (for WFMI):
2006-07-31 16:00:00,57.54,400,2701862,57.5300,57.5400
In other words, at 16:00:00, a...