\begin{table}%t1
     \caption{Models of radio SEDs.}
        \label{tab:model}%\centering
\small
\begin{tabular}{@{}cccc@{}}\hline\hline\noalign{\smallskip}
Model & $L_{\rm nt}^0$~$^{a}$ &
$E(\tau_{\rm ff})$~$^{b}$ & SFR$^{c}$ \\
\hline
A & s & s & c \\
B & s & s & b \\
C & s & m & c \\
D & s & m & b \\
E & p & s & c \\
F & p & s & b \\
G & p & m & c \\
H & p & m & b \\
\hline
\end{tabular}
\begin{list}{}{}
\item[$^{{a}}$] See Sect.~\ref{subsec:nonthermal}.
  The standard and parameterized models are denoted as "s''
  and "p'', respectively (Eqs.~(\ref{eq:nt_condon}) and
  (\ref{eq:nt_para}), respectively).
\item[$^{{b}}$] See Sect.~\ref{subsec:nonthermal}.
  The screen and mixed models are denoted as "s''
  and "m'', respectively (Eq.~(\ref{eq:screen})).
\item[$^{{c}}$] See Sect.~\ref{subsec:sfr}.
  The continuous and burst SFRs are denoted as "c''
  and "b'', respectively (Eqs.~(\ref{eq:continuous}) and~(\ref{eq:instantaneous}), respectively).
\end{list}
  \end{table}