\begin{table}[]
\centering
\rowcolors{2}{lightgray!40}{}
\caption{}
\begin{tabular}{c c}\rowcolor{lightgray} 
Method & phiD \\ 
PopED & 3080.6 \\ 
NONMEM & 3081.2 \\ 
Pumas & 3102.8 \\ 
\end{tabular} 
 label{tab:} 
 \end{table}