One of my favorite metrics are the ticks. Here you can see orders being bought and their size. If you see a someone buy, say, 20,000 contracts, especially on a niche stock, then it would be a good indicator to take a look at the chart and research the company to try and see if whoever bought that many contracts might know something you don't. Ticks are very important for that reason, as well as the number of ticks will show you how many traders are trying to get in before a potential move or sell before a potential move.
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