Customizing option columns

You can customize the data that's displayed in your options window by editing the displayed columns. Default columns contain an asterisk.     
Column Description 
Last* Last traded price for the security.
Dollar change (from the previous close).
The latest price offered to buy an option.   
The latest price offered to sell an option. 
Number of shares or contracts traded in a security or an entire market during a given period of time. 
Open int*
Total number of options contracts that are not closed or delivered on a particular day.  
Implied vol*  Estimated volatility of a security's price.
Chg % Percentage change (from the previous close).
Bid sz Number of shares/contracts a buyer is willing to purchase at the quoted bid price.  
Ask sz Number of shares/contracts a seller is selling at a quoted ask price. 
Delta Ratio comparing the change in the price of the underlying asset to the corresponding change in the price of the derivative.
Gamma Rate of change for delta with respect to the underlying asset's price. 
Theta Measure of the rate of decline in the value of an option due to the passage of time. 
Vega Amount that the price of an option changes compared to a 1% change in volatility. 
Rho Rate at which the price of a derivative changes relative to a change in the risk-free rate of interest. 
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