\begin{table}  %t2   
  %\centering
\par
 \caption{\label{tab2}Sidereal rotation rates of full cycles 9 to 23. For estimated error
 see Sect.~4.}                                                                                       \begin{tabular}{rrrrr}                                                          
 \hline\hline                                                                    
 Cycle&Beginning&Duration (d) &SIDC ($ \degr /{\rm d}$)& DRAO ($ 
 \degr /   {\rm d}$)            \\                                                             
 \hline                                                                          
  9& 1849.449& 2190&  14.36& $\ldots$ \\                                         
 10& 1855.455& 3650&  13.92& $\ldots$ \\                                         
 11& 1866.126& 5110&  13.78& $\ldots$ \\                                         
 12& 1879.795& 3650&  14.45& $\ldots$ \\                                         
 13& 1888.874& 5110&  14.31& $\ldots$ \\                                         
 14& 1901.671& 4380&  14.34& $\ldots$ \\                                         
 15& 1912.586& 3650&  14.13& $\ldots$ \\                                         
 16& 1922.838& 4380&  13.88& $\ldots$ \\                                         
 17& 1933.003& 4380&  14.17& $\ldots$ \\                                         
 18& 1944.003& 3650&  14.66& $\ldots$ \\                                         
 19& 1953.452& 3650&  14.37&  14.33\\                                            
 20& 1964.361& 4380&  14.05&  14.07\\                                            
 21& 1975.784& 3650&  14.31&  14.34\\                                            
 22& 1984.942& 4380&  14.47&  14.49\\                                            
 23& 1996.115& 3650&  14.49&  14.48\\                                            
 \hline                                                                          
 \end{tabular}                                                                   
 \end{table}