| Fields | Type | Description |
|---|---|---|
| time | datetime | Interval end time |
| usymbol | string | Underlying symbol or secid |
| firm_buy_vol | int | Aggregated firm/bd/procust buy volume |
| firm_sell_vol | int | Aggregated firm/bd/procust sell volume |
| mm_buy_vol | int | Market maker buy volume |
| mm_sell_vol | int | Market maker sell volume |
| cust_buy_vol | int | Aggregated customer buy volume |
| cust_sell_vol | int | Aggregated customer sell volume |
| tot | int | Total volume (all account types, buy+sell)/2 |