I think this is not logical, that is, your labeling of what constitutes "buy" and "sell" volume. It seems that you count a transaction at the offer as sell volume and thus color it red. This is opposite of the more intuitive way to view it-- a buy market order is matched to an offer, and thus should be colored green, and vice versa. Much in the same way the default settings for the time and sales window is such that an order at the ask is in green. So, on a big up bar with lots of market buys, I have a big red bar on the indicator.
Or am I misunderstanding the way you plot this?
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