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\section{Overview}  This document presents a parametric model to help design an Interferometric Array. It describes the relationship of design parameters in section 2 with performance objectives in section 3.   In particular, this document providesa  an explanation of the parameters and objectives selection. These explanations enable the reader to both assess completeness of the model, and accuracy of the mathematical relationships as well. Section 4 provides the python code used to generate data in the format required for visual analysis of array design options performance. The python code is consistent with parameters and objectives selection in sections 2 and 3, and the mathematical relationships between them.  \section{Design Variables}  This section aims to include all relevant design parameters that might influence the selected performance objectives. 
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