\begin{table}%t1
%\centering
\par
\caption{Ranges and steps of model parameters.}
\small%\centering
\par
\begin{tabular}{lcc}
\hline\hline
\noalign{\smallskip}
Parameter & Range & Step\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
$T_{{\rm eff}}$ (K)  & $5500 \rightarrow 7500$   & 100  \\ 
$\log (g/{\rm cm~s}^2)$  & $3. \rightarrow 5$  & 0.1\\ 
${\rm [Fe/H]}$ & $-0.5 \rightarrow 1$  & 0.05\\ 
$f_{4500}$ &  $0 \rightarrow 0.6$  & 0.05\\ 
$m_0$  & $0 \rightarrow -0.00027$ & --0.00003\\ 
\hline	     
\end{tabular}
\label{tbl1}
\end{table}