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\begin{equation}\label{eq:system_equivalent_flux_density}  SEFD = {\frac{T_{sys}}{\frac{\eta_a A}{2k_B}}}  \end{equation}  where $k_B = 1.380 x 10^{-23} 10^{-23}$  Joule K^{-1}$ $K^{-1}$  is the Boltzmann constant, $A$ is the antenna collecting area, and $\eta_a$ is the antenna efficiency. \begin{equation}\label{eq:antenna_efficiency}  \eta_a = \eta_{surface} * \eta_{aperture_blockage} \eta_{'aperture blockage'}  * \eta_{feed_spillover} \eta_{'feed spillover'}  * \eta_{illumination_taper} \eta_{'illumination taper'}  \end{equation}  \subsubsection{Maximize System Efficiency}  \begin{equation}\label{eq:system_efficiency} 
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