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\section{Objectives}\label{sec:obj}  This section aims to include array performance objectives that might be influenced by design variables in \S~\ref{sec:var}.  \subsection{Brightness Sensitivity Limit}  An overall measure of performance is the System Equivalent Flux Density, $SEFD$, defined in \cite{sensitivity}  as the flux density of a source that would deliver the same amount of power: \begin{equation}\label{eq:system_equivalent_flux_density}  SEFD = {\frac{T_{sys}}{\frac{\eta_a A}{2k_B}}}  \end{equation}  in units of Janskys where $T_{sys}$ is the system temperature including contributions from receiver noise, feed losses, spillover, atmospheric emission, galactic background and cosmic background, and $k_B = 1.380 \times 10^{-23}$ Joule $K^{-1}$ is the Boltzmann constant (see \cite{sensitivity}).  If constant.  According to \cite{sensitivity}, if  we assume N apertures with the same $SEFD$, observing the same bandwidth $\Delta\nu$, during the same integration time $t_{int}$, thenthe  weak-source limit in the sensitivity of a synthesis image of a single polarization is \begin{equation}\label{eq:sens}  \Delta I_m = {\frac{1}{\eta_s }}{\frac{SEFD}{\sqrt{(N(N-1) \Delta \nu t_{int}}}}   \end{equation}  in units of Janskys per synthesized beam area, with $\eta_s$ most important factor being $\eta_c$ (see \cite{sensitivity}). correlator efficiency $\eta_c$.  \subsection{Field of View}  \subsection{Fourier Plane Coverage}  \subsection{Operations Costs} 
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