Net Σ
Added minus pulled, one figure per row.
Each price gets one number: the size added there minus the size pulled. More added shows on the left half of the column as a solid bar; more pulled shows on the right half as a hollow outline. The two totals under the column add up the rows where more was added (+, left) and the rows where more was pulled (−, right).
Stack Σ · Pull Σ
Each side of the book, summed.
On the best ask row, Stack Σ adds up the net size of every ask price where more was added than pulled, and Pull Σ the net size of every ask price where more was pulled. On the best bid row, the same for the bid side.
Pulled, not traded
A pull is size that left without a trade.
When resting size shrinks and no trade prints at that price within a short match window (150 ms by default), it counts as pulled: cancelled or moved. Size that left through trades is not counted in these columns.
60-second reset
The counts start over every minute.
The Σ figures reset every 60 seconds by default, so they describe the last stretch of the book rather than the whole session. Change the interval in the indicator settings, or set it to 0 to keep counting until you clear it.
Tape speed dial
How fast the prints are coming.
A dial at the top of the tape panel shows prints per second over the last 5 seconds. Its full scale sits near the busiest pace of the last ten minutes, so the needle compares the tape with its own recent pace. A measurement, not a signal.