Blurb::
Specify an exponential covariance in the case where the random field is built from an analytic covariance functio. 
THIS IS AN EXPERIMENTAL CAPABILITY. 

Description::
THIS IS AN EXPERIMENTAL CAPABILITY UNDER ACTIVE DEVELOPMENT. 

<b> Default Behavior </b>
Currently, the \c build_source that is fully working is the 
\c dace_method_pointer.  The others are not fully operational. 
 

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