\begin{table}%t4
\caption{\label{tab:different_data}Best-fit model parameters based on different B/C~datasets.}
%\centering
\par
\begin{tabular}{lcccccc} 
\hline\hline \noalign{\smallskip}
Model    & $K_0^{\rm best}\times 10^2$     & $\delta^{\rm best}$ &  $V_{\rm c}^{\rm best}$ &  $V_{\rm a}^{\rm best}$  & $\chi^2$/d.o.f.   \\
Data        & (kpc$^2~$Myr$^{-1}$) &        &  (km$\;$s$^{-1}$)  & (km$\;$s$^{-1}$)   & \\
\hline
III-A  & 2.51 & 1.00 & 21.7 & 35.4 &  2.11  \\  
III-C  & 0.43 & 0.89 & 18.9 & 36.7 &  1.72  \\  
III-F  & 0.48 & 0.86 & 18.8 & 38.0 &  1.47  \\  
III-G1 & 0.53 & 0.84 & 18.0 & 37.4 &  1.80  \\  
III-G2 & 0.46 & 0.85 & 20.0 & 39.6 &  2.73  \\  
III-G1/2&0.53 & 0.83 & 19.0 & 39.1 &  2.94  \\  
III-H  & 1.85 & 0.51 & 18.1 & 54.1 &  0.25  \\  
\hline
\end{tabular}
\end{table}