\begin{table}%t3
%\centering
\par
  \caption{Ephemerides of HT Cas.\label{tab:ephem}}
  \begin{tabular}{ll}
    \hline\hline
 \multicolumn{2}{l}{\bf Linear ephemeris:} \\
 \multicolumn{2}{l}{BJDD = $T_{0}$ + $P_{0}\cdot E$} \\ [1ex]
 $T_{0} = 2443727.93804~(\pm 3)$ d & $P_{0} = 0.0736472029~(\pm 3)$ d \\
 $\chi^{2}_{\nu_{1}}= 56.9,
 \;\;\; \nu_{1}$ = 9 & $\sigma_{1}= 29.0 \times 10^{-5}$ d \\ [2ex]
\par
 \multicolumn{2}{l}{\bf Quadratic ephemeris:} \\
 \multicolumn{2}{l}{BJDD = $T_{0}$ + $P_{0}\cdot E$ + $c\cdot E^{2}$} \\ [1ex]
 $T_{0} = 2443727.93768~(\pm 3)$ d & $P_{0} = 0.0736472230~(\pm 9)$ d \\
 $c  = (-137 \pm 7) \times 10^{-14}$ d & $ \sigma_{2} = 11.8 \times 10^{-5}$ d \\
 $\chi^{2}_{\nu_{2}}= 9.47,
 \;\;\; \nu_{2}$ = 8 & \\ [2ex]
\par
 \multicolumn{2}{l}{\bf Sinusoidal ephemeris:} \\
 \multicolumn{2}{l}{BJDD = $T_{0}$ +
  $P_{0}\cdot E$ + A$\cdot \cos~[2\pi (E-{\rm B})/{\rm C}]$} \\ [1ex]
 $T_{0}= 2443727.93828~(\pm 6)$ d & $B = (89 \pm 4) \times 10^{3}$ cycles \\
 $P_{0}= 0.073647200~(\pm 2)$ d   & $C = (180 \pm 20) \times 10^{3}$ cycles \\
 $A = (46 \pm 6) \times 10^{-5}$ d & $\sigma_{\rm S}= 6.79 \times 10^{-5}$ d \\
 $\chi^{2}_{\nu_{\rm S}}= 3.11,
 \;\;\; \nu_{\rm S}= 6$ & \\
    \hline
  \end{tabular}
\end{table}