| ticker_at | string | Underlying asset type |
| ticker_ts | string | Underlying ticker source |
| ticker_tk | string | Underlying ticker |
| date | timestamp | Date and time of market data record |
| securityID | bigint | SpiderRock security ID |
| tradingDate | date | Trading date |
| tradingSession | string | Trading session ('None','RegularMkt','PreMkt','PostMkt','PostMktETF','NextDay') |
| prtOpen | double | First print price of the bar |
| prtHigh | double | Highest print price of the bar |
| prtLow | double | Lowest print price of the bar |
| prtLast | double | Last print price of the bar |
| prtVWap | double | Volume weighted average price of the bar |
| prtVolume | double | Volume of the bar |
| prtCount | int | Number of prints in the bar |
| qteHiBid | double | Highest bid of the bar |
| qteLoAsk | double | Lowest ask of the bar |
| qteTwap | double | Time weighted average price of the bar |
| qteCount | int | Number of quotes in the bar |
| bid | double | Bid at end of bar |
| ask | double | Ask at end of bar |
| bidSz | int | Bid size at end of bar |
| askSz | int | Ask size at end of bar |
| width | float | Bid-ask spread at end of bar |
| isEOB | string | "Yes" every 10 minutes, "No" otherwise |
| isEOH | string | "Yes" at the hour, "No" otherwise |