Expiration Chains

An expiration chain is the table listing the different expirations for an option market. It varies in total rows depending on the number of option expirations listed on the instrument. The Table contains the following fields:

Field
Function
Month
Enables you to suppress and edit individual volatility values.
Dots
Renders the respective option expiration using dots.
Line
Renders the respective option expiration using a line.
Expiration Switch
Toggles the display of the respective option expiration on and off. Set to on, the option expiration plays a role in calculating the skew. Set to off, the option expiration is ignored by the skew.
Xdays
Displays the number of days to expiration.
Uprice
Displays the price of the underlying instrument.
Base
Enables you to enter a base for evaluating short term interest rate futures (i.e., Eurodollars and Treasury Bills).

You can use the dots and line rendering methods together or separately, but be careful not to turn them both off. Turning both rendering methods off will suppress the option expiration from the skew window.

Field	Function
Month	Enables you to suppress and edit individual volatility values.
Dots	Renders the respective option expiration using dots.
Line	Renders the respective option expiration using a line.
Expiration Switch	Toggles the display of the respective option expiration on and off. Set to on, the option expiration plays a role in calculating the skew. Set to off, the option expiration is ignored by the skew.
Xdays	Displays the number of days to expiration.
Uprice	Displays the price of the underlying instrument.
Base	Enables you to enter a base for evaluating short term interest rate futures (i.e., Eurodollars and Treasury Bills).