\begin{table}[]
\centering
\rowcolors{2}{lightgray!40}{}
\caption{}
\begin{tabular}{c c c c c}\rowcolor{lightgray} 
Parameter & PFIM & PopED & NONMEM & MlxDesignEval \\ 
$\mu_{ka}$ & 12.1 & 12.1 & 12.1 & 12.1 \\ 
$\mu_{ke}$ & 10.5 & 10.5 & 10.5 & 10.5 \\ 
$\mu_{V_d}$ & 10 & 10 & 10 & 10 \\ 
$\mu_{EC_{50}}$ & 15.8 & 15.8 & 15.8 & 15.8 \\ 
$\mu_{n}$ & 10.5 & 10.5 & 10.4 & 10.5 \\ 
$\mu_{\delta}$ & 9.4 & 9.4 & 9.4 & 9.4 \\ 
$\mu_{c}$ & 11 & 11 & 11 & 11 \\ 
$\omega^2_{ka}$ & 39.9 & 39.9 & 39.9 & 39.9 \\ 
$\omega^2_{ke}$ & 30.7 & 30.7 & 30.7 & 30.7 \\ 
$\omega^2_{V_d}$ & 28.6 & 28.6 & 28.6 & 28.6 \\ 
$\omega^2_{EC_{50}}$ & 60.5 & 60.5 & 60.5 & 60.5 \\ 
$\omega^2_{n}$ & 29 & 29 & 29 & 29 \\ 
$\omega^2_{\delta}$ & 27.2 & 27.2 & 27.2 & 27.2 \\ 
$\omega^2_{c}$ & 32.8 & 32.8 & 32.8 & 32.8 \\ 
$a^2_{PK}$ & 8.4 & 8.4 & 8.4 & 8.4 \\ 
$a^2_{PD}$ & 9.2 & 9.2 & 9.2 & 9.2 \\ 
\end{tabular} 
 label{tab:} 
 \end{table}