\begin{table}%t1
\caption{Observational parameters of the two~\hi~surveys combined, and further corrected, to form the LAB~Survey of Galactic~\hi.}\label{tab1}
%\centering
\par
\begin{tabular}{lcc}
\hline \hline
Parameter & IAR~/~Villa Elisa  & Leiden/Dwingeloo \\
\hline
Antenna diameter  & 30 m & 25 m \\
Main beam {\it FWHM} &  30$\farcm$0 & 35$\farcm$7   \\
Mounting & equatorial  & alt-az \\ 
Declination range & $<$$-25\deg$ & $>$$-30\deg $\\
System temperature  & $\sim$$35$~K & $\sim$$35$~K \\
Front end & HEMT He-cooled & FET He-cooled \\
rms noise & $\sim$$0.07$ K &  $\sim$$0.09$ K\\
Back end & 1008 channel DAC & 1024 channel DAC \\ 
Bandwidth & 5 MHz & 5 MHz \\
Velocity coverage  & $-450$ to $+450$ \kms & $-450$ to $+400$ \kms\\
Velocity resolution  & 1.27 \kms & 1.25 \kms \\
Channel separation  & 1.05 \kms & 1.03 \kms \\
IAU standard regions & S9  & S8 and S7  \\
Observing dates & 1994 to 2000 & 1989 to 1993 \\
Number of spectra & 50~980 & 138~830 \\
Grid in $l, b$  & $0\fdg5$/cos($b$), $0\fdg5$ & $0\fdg5$/cos($b$), $0\fdg5$ \\
\hline
\end{tabular}
\end{table}