\begin{table}%t1
%\centering
\par
\caption {\label{tab:logic}Calibration test list. 
}  
\begin{tabular}{l l}        % centered columns (4 columns)
\hline\hline     
\noalign{\smallskip}
T{\sc est id} & D{\sc escription} \\
\hline
\multicolumn{2}{c}{F\sc unctionality} \\
{\tt RCA\_{\rm A}MB} & Functional test at ambient \\
{\tt RCA\_CRY} & Functional test at cryo \\
\multicolumn{2}{c}{T\sc uning} \\
{\tt RCA\_TUN} & Gain and offset tuning of the DAE \\
               & Tuning of the front end module \\
               & (phase switches and gate voltages) \\
\multicolumn{2}{c}{B{\sc asic} P{\sc roperties}} \\
{\tt RCA\_OFT} & Radiometer offset \\
               & measurement  \\
{\tt RCA\_TNG} & Noise temperature and \\
               & photometric gain \\
{\tt RCA\_LIS} & Radiometer linearity \\
\multicolumn{2}{c}{N{\sc oise} P{\sc roperties}} \\
\par
{\tt RCA\_STn} & Noise performances tests: \\
                & WN, $f_{\rm k}$ and $\alpha$, $\beta$, $r$ \\
{\tt RCA\_UNC} & Verification of the effect  \\
               & of the radiometer switching \\
               & on the noise spectrum \\
\multicolumn{2}{c}{B{\sc and} P{\sc ass} R{\sc esponse}} \\
{\tt RCA\_SPR} & Bandpass \\
\multicolumn{2}{c}{S\sc usceptibility} \\
{\tt RCA\_THF} & Susceptibility to \\
               & FEM temperature variations \\
{\tt RCA\_THB} & Susceptibility to  \\
               & BEM Temperature variations \\
{\tt RCA\_THV} & Susceptibility to V-groove \\
               & temperature variations \\
\hline                                  %inserts single line
\end{tabular}
\tablefoot {The first column reports the test identification. In the second column the purpose of each test is described; WN is the white noise level; $f_{\rm k}$, $\alpha$ are the $1/f$ knee frequency and slope respectively; 
$\beta$ is the equivalent radiometer bandwidth derived from noise; $r$ is the modulation factor. Apart from the first test {\tt RCA\_{\rm A}MB}, which is performed at ambient temperature, all the other tests are performed at the operational temperature (i.e. at a temperature as close as possible to in-orbit conditions).  }
\end{table}