Price-based Columns

To display/remove market data columns on a page

Right click any column heading on a trading page, and select Customize Layout.
Click the Market Data Columns tab to view columns.

The columns already displayed on your trading window appear in the Shown Columns list on the left side of the page. The remaining columns are grouped by category in the Available Columns list to the right.

Expand the Prices category in the right pane and Add or Remove fields from the trading window.

Column Name	Description
Prices
Ask	The best ask price for a contract. This is the best price at which you could currently BUY.
Ask Size	The approximate depth of the current offer.
Bid	The best bid price for a contract. This is the best price at which you could currently SELL.
Bid Size	The approximate depth of the current bid.
Change	How much the current price has risen or declined from the previous day's closing price. If the price has declined, the background is red. If the price has risen, the background is blue. To toggle between dollar change and percent change, click the column title.
Change (%)	The percentage that the current price has risen or declined from the previous day's closing price. If the price has declined, the background is red. If the price has risen, the background is blue. To toggle between percent change and dollar change, click the column title.
Change Since Open	The change in price (by dollar value or percent) since the day's opening price. If the price has declined, the background is red. If the price has risen, the background is blue. To toggle between percent change and dollar change, click the column title.
Close	Displays the last available closing price for the asset. For US equities, we use corporate action processing to get the closing price. This means the close price is adjusted to reflect forward and reverse splits, and cash and stock dividends.
Gap	Displays the difference between the previous night's closing price and the day's opening price. You can toggle this display between showing the gap in currency units or percentage points (100% x Gap / Today's Open). To toggle the display, right-click the column title and select Toggle Display.
Last	The last price at which the contract traded. A "C" in front of the last price indicates that this is the previous day's closing price.
Last Size	The size of the last contract traded. If the last contract traded is larger than the previous one, the font is green. If it's smaller, the font is red.
Mark Price	The mark price is equal to the LAST price unless: Ask < Last - then the mark price is equal to the ASK price. Bid > Last - then the mark price is equal to the BID price.
Mid	The midpoint between the current bid and ask.
Open	The opening price for the day.
Spread	The difference between the current ask and bid.