market freq_block bid_round bid_amt bidder_num date time net_bid_amt min_accept num_of_bids sort_col_1 sort_col_2 N001 7 18500000 0252 4/1/97 11:52:56 18500000 21275000 0 1 1 N002 8 21000000 0251 4/1/97 12:06:36 21000000 24150000 3 1 2