[EXPLAIN]

1.Symbol
    A code stands for the variety of resin and delivery date. It consists of two capital letters and four digits. The initial two capital letters show the resin variety, the middle two digits represent the year, the last two digits represent the delivery month.
    Take LL0410 for example, LL stands for LLDPE (Lined low density polyethylene resin) , 0410 stands for that the date of delivery is the appointed date in October of 2004. Similarly, PP stands for PP (Polypropylene resin), and AB stands for ABS (Acrylonitrile Butadiene Styrene).

2.Order
    The total volume of a certain variety which has already signed the electronic contract, not yet delivered.
A unit is 5t.

3.Pre-settle
    Settlement price of last business day.

4.Open
    Opening quotation, the first deal price of a certain trade variety intraday.

5.High
    The highest deal price of a certain trade variety intraday.

6.Low
    The lowest deal price of a certain trade variety intraday.

7.Settle
    Settlement price, the weighing average price of all the deals for a certain trade variety intraday.

8.Last
    Recent quotation, the latest deal price of a certain trade variety.

9.Bid
    The highest buying price of a certain trade variety till now intraday.

10.Bid Vol
    The volume correspondent to the bid above. A unit is 5t.

11.Ask
    The lowest selling price of a certain trade variety till now intraday.

12.Ask Vol
    The volume correspondent to the ask above. A unit is 5t.

13.Volume
    The total accumulated deal volume of a certain trade variety intraday. A unit is 5t.

14.Change
    The price gap between last and pre-settle . Positive number stands for rising, negative number stands for falling.