\begin{table}%t3
\caption{\label{tab:systematics_gamma}Best-fit transport parameters for different slopes $\gamma$.}
%\centering
\par
\begin{tabular}{lcccccc} \hline\hline\noalign{\smallskip}
$\gamma$  & $K_0^{\rm best}\times 10^2$     & $\delta^{\rm best}$ &  $V_{\rm c}^{\rm best}$  &  $V_{\rm a}^{\rm best}$  & $\chi^2$/d.o.f.   \\
        & (kpc$^2~$Myr$^{-1}$) &                     &  (km$\;$s$^{-1}$)  & (km$\;$s$^{-1}$)   & \\\hline
& \multicolumn{1}{c}{} \vspace{-0.20cm} \\ 
0:~$2.55$         &    4.13    &    0.39    &    \dots   &    \dots   &    29.7    \vspace{0.05cm}\\  %chi2=861.177 (31)
{\it 0:}~${\it 2.65}$   & {\it 4.08} & {\it 0.40} & {\it \dots}& {\it \dots}& {\it 28.8} \vspace{0.05cm}\\  %chi2=834.898 (31)
0:~$2.75$         &    4.02    &    0.40    &    \dots   &    \dots   &    27.9    \vspace{0.05cm}\\  %chi2=809.243 (31)
0:~$2.85$         &    3.97    &    0.40    &    \dots   &    \dots   &    27.0    \vspace{0.25cm}\\  %chi2=784.222 (31)
%
I:~$2.55$         &    0.42    &    0.93    &    14.0    &    \dots   &    11.4    \vspace{0.05cm}\\  %chi2=317.968 (31)
{\it I:}~${\it 2.65}$   & {\it 0.42} & {\it 0.93} & {\it 13.5} & {\it \dots}& {\it 11.2} \vspace{0.05cm}\\  %chi2=313.468 (31)
I:~$2.75$         &    0.42    &    0.93    &    13.1    &    \dots   &    11.0    \vspace{0.05cm}\\  %chi2=308.976 (31)
I:~$2.85$         &    0.42    &    0.93    &    12.7    &    \dots   &    10.9    \vspace{0.25cm}\\  %chi2=304.501 (31)
%
II:~$2.55$        &    9.41    &    0.24    &    \dots   &    74.2    &    4.52    \vspace{0.05cm}\\  %chi2=126.547 (31)
{\it II:}~${\it 2.65}$  & {\it 9.76} & {\it 0.23} & {\it \dots}& {\it 73.1} & {\it 4.73} \vspace{0.05cm}\\  %chi2=132.498 (31)
II:~$2.75$        &    10.1    &    0.23    &    \dots   &    72.1    &    4.94    \vspace{0.05cm}\\  %chi2=138.361 (31)
II:~$2.85$        &    10.4    &    0.22    &    \dots   &    71.0    &    5.15    \vspace{0.25cm}\\  %chi2=144.132 (31)
%
III:~$2.55$       &    0.52    &    0.84    &    18.9    &    39.7    &    1.25    \vspace{0.05cm}\\  %chi2=33.8644 (31)
{\it III:}~${\it 2.65}$ & {\it 0.48} & {\it 0.86} & {\it 18.8} & {\it 38.0} & {\it 1.47} \vspace{0.05cm}\\  %chi2=39.7024 (31)
III:~$2.75$       &    0.45    &    0.87    &    18.8    &    36.4    &    1.75    \vspace{0.05cm}\\  %chi2=47.2764 (31)
III:~$2.85$       &    0.42    &    0.88    &    18.6    &    35.0    &    2.10    \vspace{0.10cm}\\  %chi2=56.815  (31)
% N.B.: 161 steps between 0.05 and 5000 GeV/n used
\hline
\end{tabular}
\tablefoot{Models 0, I, II, and III for $L=4$~kpc. The parameter $\gamma$ is the slope of the
propagated fluxes ($\gamma = \alpha+\delta$). The source spectrum is $Q(E)\propto \beta^{\eta_{\rm S}}
{\cal R}^{-\alpha}$, and $\eta_{\rm S}=-1$.}
\end{table}