| fkey_at | string | Future asset type |
| fkey_ts | string | Future ticker source |
| fkey_tk | string | Future ticker |
| fkey_dt | date | Futures expiration date |
| tradingDate | date | Trading date |
| tradingSession | string | Trading session ('None','RegularMkt','PreMkt','PostMkt','PostMktETF','NextDay') |
| srCloseTime | time | SpiderRock closing mark time |
| clsMarkState | string | Close mark state ('ExchClose','Final','LastPrt','None','SRClose') |
| opnPrc | double | Opening price |
| minPrc | double | Session minimum price |
| maxPrc | double | Session maximum price |
| openInterest | int | Open Interest (1 day delayed) |
| prtCount | int | Total number of prints for the day |
| prtVolume | int | Total volume of contracts traded for the day |
| realizedCnt | int | Realized count |
| realizedVol | float | Realized volatility |
| avgMktSize | float | Average market size (bid size + ask size) / 2 |
| avgMktWidth | float | Average market width (ask price - bid price) |
| bidPrc | double | Bid at srCloseTime |
| askPrc | double | Ask at srCloseTime |
| srClsPrc | double | SpiderRock closing mark |
| closePrc | double | Official closing price from exchange |
| priorDate | timestamp | Prior trading date |
| priorSRClsPrc | float | Value archived in the previous trading period |
| priorClosePrc | float | Prior trading day closing price |