| okey_at | string | Option underlying asset type |
| okey_ts | string | Option ticker source |
| okey_tk | string | Option underlying symbol |
| okey_dt | date | Option expiration date |
| okey_xx | double | Option strike |
| okey_cp | string | Option call/put indicator |
| date | timestamp | snapshot interval timestamp (UTC) |
| tradingDate | date | Trading date |
| tradingSession | string | Trading session ('None','RegularMkt','PreMkt','PostMkt','PostMktETF','NextDay') |
| undSecKey_at | string | Underlying asset type |
| undSecKey_ts | string | Underlying security trade source |
| undSecKey_tk | string | Underlying ticker |
| undSecKey_dt | date | Underlying expiration date |
| undSecType | string | Underlying security type |
| securityID | bigint | SpiderRock security ID |
| uBid | double | Underlying bid at date (column value) |
| uAsk | double | Underlying ask at date (column value) |
| uPrc | double | Underlying price at date (column value) |
| synSpot | double | Synthetic spot price (relevant for options priced using forwards) |
| bidPrc | float | Option bid at date (column value) |
| askPrc | float | Option ask at date (column value) |
| bidSz | int | Largest NBBO bid size among all exchanges |
| askSz | int | Largest NBBO ask size among all exchanges |
| cumBidSize | int | Total NBBO bid size across all exchanges |
| cumAskSize | int | Total NBBO ask size across all exchanges |
| bidExch | string | Exchange for bidSz |
| askExch | string | Exchange for askSz |
| bidMask | bigint | Contains a bit mask of all the option exchanges that are currently participating in the bid |
| askMask | bigint | Contains a bit mask of all the option exchanges that are currently participating in the ask |
| bidPrice2 | float | 2nd best bid price |
| askPrice2 | float | 2nd best ask price |
| cumBidSize2 | int | Total 2nd best bid size across all exchanges |
| cumAskSize2 | int | Total 2nd best ask size across all exchanges |
| bidIV | float | Implied vol of bidPrc |
| askIV | float | Implied vol of askPrc |
| srPrc | float | SpiderRock calculated option price from srVol |
| srVol | float | SpiderRock surface volatility at date (column value) |
| de | float | Option Delta calculated using srVol |
| ga | float | Option Gamma calculated using srVol |
| th | float | Option Theta calculated using srVol |
| ve | float | Option Vega calculated using srVol |
| rh | float | Option Rho calculated using srVol |
| ph | float | Option Phi calculated using srVol |
| vo | float | Option Volga calculated using srVol |
| va | float | Option Vanna calculated using srVol |
| srSlope | float | Partial derivative of SR surface volatility with respect to uPrc - dVol/dUPrc (SSR=0) |
| deDecay | float | Option Delta time decay calculated using srVol (Charm, Delta Bleed) |
| sdiv | float | SpiderRock implied continuous dividend rate |
| ddiv | float | Sum of dividends paid to expiration |
| ddivPv | float | Present value of dividends paid to expiration |
| rate | float | SpiderRock calibrated risk free rate |
| years | float | SpiderRock volatility time to expiration in years |
| yearsC | float | Calendar time to expiration in years |
| sDaysT | int | Days to settlement if option was exercised today |
| sDaysE | int | Days to settlement upon expiration |
| atmVol | float | ATM Volatility |
| error | int | Internal use (pricing model error code) |
| prtVolume | int | Total volume on the trading day. |
| timestamp | timestamp | time the snapshot was actually taken (UTC) |
| modelType | string | Model type - Normal/LogNormal |
| prcFramework | string | Pricing framework - Spot (Equity), Forward (Cash), Future, Physical |
| exType | string | Expiration type (American or European) |