\begin{table}%t1
\caption{\label{obs_log}Arches ($\alpha = 17^{\rm h}45^{\rm m}50^{\rm s}, \delta = -28^{\circ}49{'}28{''}$, J2000) Observing Log.}             
\small%\centerline
 {
 \begin{tabular}{c c c c c c c c}     
 \hline\hline       
&&&&&&& \\[-8pt]
UT & Filter & $N$ $^{{a}}$ & $t^{{b}}$~[s]  & Airmass & Seeing$^{{c}}$~($''$) & {\it FWHM}~($''$) & Strehl ratio\\ 
 \hline                    
01:24:15--01:54:20  & $J$	&  5	& 200 s& 1.13--1.22	& 0.82	& 0.17 & 0.05\\
00:52:15--01:16:46  & $H$	&  8	& 100 s & 1.07--1.11	& 1.1	& 0.11 & 0.11\\
00:14:40--00:47:02  & $K_{\rm S}$  & 12	& 60 s & 1.02--1.06	& 0.95	& 0.09 & 0.27\\
 \hline                  
 \end{tabular}}
\medskip
$^{{a}}$ Number of exposures;
$^{{b}}$~integration time of each exposure;
$^{{c}}$~average value of the DIMM Seeing during observations (taken in the optical $V$~band). It is stressed that in Paranal the DIMM~values can be significantly larger than the image quality measured at the telescope.
\end{table}