Similar to a normal volume indicator, but very different. Buy orders will be shown above a zero level, sell orders below it. An additional plot indicates the difference between the two.
Available for trades of any size, but also for categories based on the trade's size valued in USD. Categories are divided between these amounts: 0, 1k, 10k and 100k.
A separate indicator, based on mean volume instead of total volume, can also be displayed. It is calculated by dividing total trade volume by trade count.