\begin{table}[]
\centering
\rowcolors{2}{lightgray!40}{}
\caption{}
\begin{tabular}{c c c c c}\rowcolor{lightgray} 
Parameter & PFIM & PopED & NONMEM & MlxDesignEval \\ 
$\mu_{Cl}$ & 2.9 & NA & 2.9 & 2.9 \\ 
$\mu_{V}$ & 4.3 & NA & 4.3 & 4.3 \\ 
$\beta_{Cl, CLCR}$ & 8.4 & NA & 8.4 & 8.4 \\ 
$\beta_{V, Weight}$ & 9.5 & NA & 9.5 & 9.5 \\ 
$\beta_{V, Sex}$ & 17.8 & NA & 17.8 & 17.8 \\ 
$\omega^2_{Cl}$ & 20.1 & NA & 20.1 & 20.1 \\ 
$\omega^2_{V}$ & 15.1 & NA & 15.1 & 15.1 \\ 
$a^2$ & 9.8 & NA & 9.8 & 9.8 \\ 
$b^2$ & 15.8 & NA & 15.8 & 15.8 \\ 
\end{tabular} 
 label{tab:} 
 \end{table}