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What do the two red and white columns or green and white columns in the futures trading volume column mean?
The red column is the positive line, which represents the rise. The green column is a negative line, indicating a decline.

When the closing price of the day is higher than the opening price of the day, it is a positive line and a red column.

When the closing price was lower than the opening price of the day, it was a negative line and a green column.

The closing price of the day is the same as the closing price of the day, showing a white cross.