\begin{table}%t1
\caption{Parameters of the computer-simulated LBT raw images (Fig.~\ref{fig:ngc3504_rec}).\label{tab:compsim1_param}}
\begin{tabular}{p{55mm}p{45mm}} \hline \hline
Primary mirror size & 8.4~m \\ \hline
Primary mirror center-to-center distance & 14.4~m \\  
Optical transmission & 0.5 \\  
Quantum efficiency of the detector & 0.6 \\  
Number of pixels per frame & 2048 $\times$ 2048   \\  
Pixel size & 5.0 mas \\  
read-out noise & 11 $e^-$ \\  
Central wavelength / & 1.25/0.3 $\mu$m \\
bandwidth &  \\  
Object type & extended galaxy based on the HST image of NGC~3504 \\  
Total object magnitude & $m_{J} = 17.0$ \\  
Magnitudes of the 4 reference stars in the 2048$\times$2048 pixel FOV & $m_{J}$ = 20.0, 20.5, 20.5, 21.0 \\  
Magnitude of the sky background per square arcsec & $m_{J} = 16.0$ \\  
Position angles of the pupil axis & $0^\circ$, $30^\circ$, $60^\circ$,
$90^\circ$, $120^\circ$, $150^\circ$ \\  
Strehl ratio & 0.3 \\  
Exposure time & 600 s  for each of the above six pupil position angles \\ \hline
 \end{tabular}
\end{table}