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This section aims to include array performance objectives that might be influenced by design variables in \S~\ref{sec:var}.  \subsection{Fourier Plane Coverage}  As derived in \cite{design}, the antenna diameter determines its beam size $\theta_{ant} \approx \frac{\lambda}{D}$. If the plane area $\frac{B}{\lambda}$ is divided in cells of size $\frac{D}{\lambda}$ then   \begin{equation}\label{eq:correlator_efficiency} \begin{equation}\label{eq:fourier}  \eta_c(t_{int}) = \frac{\text{correlator sensitivity}}{\text{sesitivity of a perfect analog correlator having the same } t_{int}}  \end{equation}   \subsection{Point Source Sensitivity} 
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\section{Visualization Tool Notes}  \section{Conversation notes}  \subsection{Engineering cost vs. Calibration cost}  Tricky because you can compensate antenna quality with software. So the equations must capture this trade off.