\begin{table}%t2
\caption{\label{tab2}Sensitivity budget for LFI units.}
%\centering
\par
\begin{tabular}{lp{4.5cm}ccc}
\hline \hline \noalign{\smallskip}
Symbol &  Name & 30 GHz & 44 GHz & 70 GHz  \\ 
\hline
$L_{\rm Feed} L_{\rm OMT}$ [dB]&Feed + OMT insertion loss  \dotfill &$-$0.25&$-$0.25&$-$0.25 \\
$T_{\rm FE}$ [K]&FEM noise temperature \dotfill&8.6&14.1&25.7 \\
$T_{\rm Feed}+T_{\rm OMT}+T_{\rm FE}$ [K]&\dotfill&10.4&16.2&28.5 \\
$G_{\rm FE}$ [dB]&FEM gain \dotfill&$>$30&$>$30&$>$30 \\
$L_{\rm WG}$ [dB]&Waveguide insertion loss \dotfill&$-$2.5&$-$3&$-$5 \\
$T_{\rm BE}$ [K]&BEM noise temperature \dotfill&350&350&450 \\
$T_{\rm WB}+T_{\rm BE}$ [K]&\dotfill&0.3&0.4&0.7 \\
$T_{\rm sys}$ [K]&System temperature \dotfill&10.7&16.6&29.2 \\[2pt]
\hline
\end{tabular}
\end{table}