A grid of 3,600 cells for every networkBitcoin / TetherUSBINANCE:BTCUSDTMarketFlowResearchW from 10 to 720 minutes, θ/W from 0.02 to 1.00 — each cell is a full trading run on 38 days of BTC validation. For each candidate, every cell of the grid is a run of one side on its own: the signal fires the moment the sum of probabilities over the last W minutes reaches θ; the trade is a long for a buy network or a short for a sell network; one trade per 2.3% zigzag leg; take-profit 1.9%, stop 2.5%; costs 0.07% per side; $1000 start. W runs 10 to 720 minutes in 10-minute steps (72 rows), and θ/W — the average probability needed in the window — runs 0.02 to 1.00 in steps of 0.02 (50 columns). The 90% zone is the largest rectangle around the best cell in which every cell earns at least 90% of the best. Its area, in cells, says how forgiving the network is: a wide zone means a slightly different window or threshold gives nearly the same money; a one-cell zone means the result exists at one point only. The network's working W and θ are taken from the middle of its zone, not from the best cell. Part 1 of 3 of our study «Picking a Network by the Width of Its Good Zone, Not Its Best Point — 42 "Potentially Best" Networks». BTC/USDT, order-book data, every number from the research log. AI-assisted research, human-reviewed. Not financial advice.