\begin{table}%t2
      \caption{Calibration constants for the UV luminosities vs. SFR~\mbox{relations}. }
   \label{calib2}
      %\centering
\par
        \begin{tabular}{r|rr|rr}\hline\hline
	 \multicolumn{1}{c}{${M_{\rm up}}$} & \multicolumn{2}{|c|}{100~\msun} & \multicolumn{2}{c}{120~\msun}\\
        \hline
	 $Z$& ${C_{1500}}$& ${C_{2800}}$ & ${C_{1500}}$& ${C_{2800}}$\\
	\multicolumn{1}{c}{} & \multicolumn{2}{|c}{$\left[{\times10^{27}\frac{{\rm erg ~ s^{-1}~ Hz^{-1}}}{M_\odot ~ {\rm yr}^{-1}}}\right]$} & \multicolumn{2}{|c}{$\left[{\times10^{27}\frac{{\rm erg ~ s^{-1} ~ Hz}^{-1}}{M_\odot ~ {\rm yr}^{-1}}}\right]$}\\[2mm]
        \hline
          0.0004 & 14.6 & 13.7 & 14.8 & 13.9 \\
          0.004  & 12.8 & 11.8 & 13.1 & 12.0 \\
          0.008  & 11.9 & 10.8 & 12.2 & 11.0 \\
          0.02   & 10.6 & 10.0 & 11.0 & 10.3 \\
          0.05   &  9.3 &  8.9 &  9.8 &  9.2 \\
        \hline
       \end{tabular}
\end{table}