You can refer to the Data Model Discovery for the definitions of real-time fields.
TRDPRC_1 "LAST" 6 TRDPRC_2 PRICE 17 REAL64 7 ! ! Last trade price or value. ! OFF_CLOSE "OFFICIAL CLOSE" 3372 NULL PRICE 17 REAL64 7 ! ! The official closing price for this market. Price may be qualified by CLOSE_TONE !
I hope this can be of help