\begin{table}%t1
\caption{Spectral index of $\nu F_\nu$ spectrum of gamma-rays
($\nu F_\nu\propto\nu^\alpha$) for various cases.
Hadronic emission model in the case of efficient acceleration (Ia)
predicts similar $\gamma$-ray spectral slope with the leptonic,
inefficient acceleration model with weak magnetic field (IIIb).
On the other hand, hadronic inefficient acceleration models 
(IIa and IIIa) predict similar $\gamma$-ray spectral slope
with the leptonic, moderate magnetic field model (IIb).
}
\label{table:1}
%\centering
\par
\begin{tabular}{c l | l | l}
\hline\hline       
%
&  & (a) $\pi^0$ model                
   & (b)  IC     model            \\
&  & ~~~~ $\alpha\approx2-s_{\rm p}$ 
   & ~~~~ $\alpha=-(s_{\rm e}-3)/2$ \\
%
\hline
%
I & Efficient acc. (strong $B$-field) & 
(Ia) $s_{\rm p}\approx1.5$, $\alpha\approx0.5$   & 
(Ib) $s_{\rm e}\approx2.5$, $\alpha\approx0.25$    \\  
%
%\hline
%
II & Inefficient acc. (moderate $B$-field) & 
(IIa) $s_{\rm p}\approx2$,   $\alpha\approx0$     & 
(IIb) $s_{\rm e}\approx3$,   $\alpha\approx0$  \\  
%
%\hline
%
III & Inefficient acc. (weak $B$-field) & 
(IIIa) $s_{\rm p}\approx2$,   $\alpha\approx0$     & 
(IIIb) $s_{\rm e}\approx2$,   $\alpha\approx0.5$  \\  
%
\hline                  
\end{tabular}
\end{table}