\begin{table}%t1
\caption{Observing log.}
\label{tab1}
%\centerline
{
\begin{tabular}{llllll} \hline\hline
Group name       & Exp. time                    & $\langle$seeing$\rangle$ & FLI$^{a}$ & $\langle$X$\rangle^{b}$  & Sky transparency$^{c}$ \\ 
                 & (s)                    &              &           &           & \\ \hline
PCG~100355+190454 & 2 $\times$ 900 (A,D); 2 x 720 (B,C) & 0.9$\arcsec$ & 100      & 1.5        & CLR/THN\\
PCG~101345+194541 & 2 $\times$ 900 (A,B,C,D)            & 0.8$\arcsec$ & 30       & 1.6        & CLR/THN\\
PCG~103349+225324 & 2 $\times$ 900 (A,D); 2 x 720 (B,C) & 0.9$\arcsec$ & 100      & 1.9        & CLR/THN\\ 
PCG~103959+274947 & 2 $\times$ 720 (A,B); 2 x 900 (C,D) & 1.0$\arcsec$ & 80       & 1.9        & CLR \\
PCG~104338+281711 & 2 $\times$ 720 (A,B); 2 x 900 (C,D) & 1.2$\arcsec$ & 40       & 1.7        & THN \\
PCG~104538+175826 & 2 $\times$ 720 (A,B); 2 x 900 (C,D) & 1.0$\arcsec$ & 90       & 1.5        & CLR/THN\\
PCG~110941+203320 & 2 $\times$ 900 (A,B,C,D)            & 1.2$\arcsec$ & 90       & 1.6        & CLR/THN\\     
PCG~114233+140738 & 2 $\times$ 900 (A,B,C,D)            & 0.9$\arcsec$ & 20       & 1.5        & CLR/THN\\     
PCG~114333+215356 & 2 $\times$ 900 (A,B,C,D)            & 1.0$\arcsec$ & 100      & 1.6        & CLR/THN\\
PCG~121157+134421 & 2 $\times$ 900 (A,B,C,D)            & 1.2$\arcsec$ & 60       & 1.6        & THN \\    
PCG~121252+223519 & 2 $\times$ 900 (A,B,C,D)            & 0.8$\arcsec$ & 100      & 1.7        & CLR/THN\\
PCG~121516+153357 & 2 $\times$ 720 (A,B,C,D)            & 1.0$\arcsec$ & 30       & 1.4        & CLR/THN\\         
PCG~130157+191511 & 1 $\times$ 720 (A,B,C,D)            & 0.9$\arcsec$ & 70       & 1.5        & CLR \\  
PCG~130926+155358 & 2 $\times$ 900 (A,B,C,D)            & 0.7$\arcsec$ & 80       & 1.8        & CLR \\    
PCG~145239+275905 & 2 $\times$ 720 (A,B); 2 x 1200 (C,D)& 0.7$\arcsec$ & 90       & 1.9        & CLR \\
PCG~154930+275637 & 2 $\times$ 900 (A,B,C,D)            & 1.2$\arcsec$ & 60       & 1.9        & THN \\    
PCG~161754+275834 & 2 $\times$ 900 (A,B,C,D)            & 0.7$\arcsec$ & 90       & 1.8        & CLR \\
PCG~170458+281834 & 2 $\times$ 900 (A,B,C,D)            & 1.0$\arcsec$ & 50       & 1.9        & CLR/THN\\ \hline
\end{tabular}}\medskip
{$^a$  FLI = fraction of illuminated moon.} \\
{$^b$  Average airmass of the group.} \\
{$^c$  CLR = clear; THN = thin cirrus.}
\end{table}