\begin{table}%T5
\caption{\label{tab_error}Estimated errors in DWD birthrates for the thin disk.}
\small%\centering
\par
\begin{tabular}{lccrr}
\hline\hline\noalign{\smallskip}
$p$ & $\langle p\rangle$ & $\langle\delta p\rangle$
                         & $\partial \nu / \partial p$ & $\delta \nu_p / \nu$ \\
\noalign{\smallskip}\hline\noalign{\smallskip}
$\gamma            $ & $ 1.5$ & 0.1 & $3.4\times10^{-4}$ & 0.016 \\
$\log Z            $ & $-1.7$ & 0.5 & $4.3\times10^{-3}$ & 0.102 \\
$t~{\rm Gyr^{-1}} $ & $14$   & 1   & $0.1\times10^{-3}$ & 0.005 \\
$\alpha_{\rm IMF}$  & $-2.2$ &  0.1  & $8.6\times10^{-4}$ & 0.041 \\
$a_{\rm SFR}$  &  11   &   1  & $1.0\times10^{-3}$ & 0.047  \\
\hline  
\end{tabular} 
\end{table}