\begin{table}%t4
  %\centering
\par
    \caption{\label{observing_log}Observing log.}
  %\centerline
{  \small    \begin{tabular}{lllrllllll}
      \hline\hline\noalign{\smallskip}
      Name      & Start time   & End time     & \multicolumn{1}{l}{Duration} & No. of $P_{\rm{orb}}$ & No. of $P_{\rm{spin}}$ & Filters     & Exposure time$^b$ & Resolution$^c$ & $V^d$\\
                & (HJD$^a$)    & (HJD$^a$)    & \multicolumn{1}{l}{(mins)}   &		      	 &		      &             & (s)	          & (s)            & (mag) \\
      \hline
      DQ Her    & 13~948.4240 & 13~948.5349 & 159.7		       & 0.57		 & 67.4                   & {\it UBVRI} & $1\times10$       & $\sim$24       & 14.5\\
      RXJ2133   & 13~948.5732 & 13~948.6542 & 116.6		       & 0.27		 & 12.3		      & {\it UBVRI} & $4\times10$       & $\sim$96       & 15.3\\
      FO Aqr    & 13~948.6933 & 13~948.7091 &  22.8                        & 0.08	 	 & 1.1$^e$                & {\it UBVRI} & $2\times10$       & $\sim$48     & 13.9\\
      AE Aqr    & 13~949.5103 & 13~949.5704 &  86.5                        & 0.15		 & 156.8		      & {\it UBVRI} & $1\times3$        & $\sim$8.5      & 11.4\\
      V2306 Cyg & 13~949.5794 & 13~949.6528 & 105.7                        & 0.40		 & 4.3                    & {\it UBVRI} & $2\times10$	& $\sim$48       & 14.7\\
      AO Psc    & 13~949.7047 & 13~949.7194 &  21.2                        & 0.10 		 & 1.6$^e$                & {\it UBVRI} & $2\times10$	& $\sim$48       & 13.2\\
      RXJ1730   & 13~950.4112 & 13~950.5134 & 147.2                        & 0.16		 & 69.0                   & {\it UBVRI} & $1\times10$	& $\sim$24       & 16.3\\
      V1223 Sgr & 13~950.5298 & 13~950.5871 &  82.5                        & 0.41		 & 6.6                    & {\it UBVRI} & $2\times10$	& $\sim$48       & 13.7\\
      AE Aqr    & 13~950.6224 & 13~950.6366 &  20.4                        & 0.03		 & 37.0		      & {\it UBVRI} & $1\times1$        & $\sim$4.5      & 11.6\\
      RXJ2133   & 13~950.6455 & 13~950.7187 & 105.4		       & 0.24		 & 11.1		      & {\it UBVRI} & $4\times10$       & $\sim$96       & 15.2\\
      \hline
    \end{tabular} }
    \medskip 
    $^a$ $+$2~440~000; $^b$~the number of orientations of the wave plate, and the time spent at each orientation;  $^c$~the resolution is roughly the number of
      orientations of the wave plate multiplied by the exposure time
      multiplied by two (to account for the ordinary and extraordinary measurements) plus some mechanical dead time; $^d$~measured; $^e$~these data sets are short and therefore the reported uncertainties are probably underestimated.
    \end{table}