Blurb::
Specify the form of the expansion to be used in the random field representation.
THIS IS AN EXPERIMENTAL CAPABILITY. 

Description::
This control allows the user to specify the form of 
the random field representation (e.g. either a Karhunen-Loeve or Principal Components expansion). 
THIS IS AN EXPERIMENTAL CAPABILITY UNDER ACTIVE DEVELOPMENT. 

<b> Default Behavior </b>
The default expansion form is Karhunen-Loeve.

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