data/flow_map.json, written each 5-min poll cycle.What you're looking at. Top: every strike's flow over the session — watch a band brighten and migrate as flow concentrates and price moves through it. Toggle to Building Δ to see only what's changing each window — the freshest read, and where a turn shows up first. Bottom: the selected window's flow change per strike, so you can see what's accumulating right now rather than the diluted session total. Drag the slider to scrub. Observation only — this tab fires no signals.