Structural OI GEX answers: what inventory was already on the books. Orderflow GEX answers: what is being aggressed this minute. If you only watch one, you will misread quiet opens and busy midday rewrites.
On the GammaTape desk
- Chart / GEX — walls and profile from the chain (OI and Vol weightings).
- Flow — OF DEX / OF GEX / OF Conv tiles plus the premium tape when it warms.
- Quant — ATM IV smile, term structure, ΔOI movers once the engine fills those fields.
Empty tape mid-session usually means warm-up or a quiet premium filter — not a broken product. Use OF history sparks and last OF GEX while prints accumulate.