Several days
Chained profiles with every session's extremes labelled and carried forward.
One profile per time window, chained across days, with each one's high and low carried forward. It is how you see where Asia's work stands when London opens.
Every window builds its own, lined up in time. You can tell at a glance whether today's session repeats yesterday's split or contradicts it.
Each session's high and low extend with their label. Those are the levels the market tends to come back for.
The profile can be built from the imbalance or from total volume, depending on what you want to read.
The names the indicator uses, and what each one means.