\begin{table}%t2
%\centering
\par
\caption{\label{tabella2}Spectral correlations (for $r\backsimeq {\rm const.}$). We have denoted with $(\gamma_{\rm p})$ or $(B)$ the variations driven by increases of rms electron energy or magnetic field, respectively.}
\par
\small
\begin{tabular}{llcc}
\hline\hline
Process & Peak flux and frequency & Flux-frequency correlation & $S-C$ correlation\\
\hline
synchrotron & $\begin{array}{l}
                S\propto R^3~B^2~\gamma_{\rm p}^2~ n~ \delta^4 \\
                \xi\propto B~\gamma_{\rm p}^2~\delta
              \end{array}$ &$S\propto\xi^\alpha\left\{{\begin{array}{c}
                \alpha=1 ~\left({\gamma_{\rm p}}\right) \\
                \alpha=2 ~\left({B}\right)
              \end{array}}\right.$&\\
\hline
IC Thomson & $\begin{array}{l}
                C\propto R^4~B^2~\gamma_{\rm p}^4~ n^2~ \delta^4 \\
                \epsilon\propto B~\gamma_{\rm p}^4~\delta
              \end{array}$ &$C\propto\epsilon^\alpha\left\{{\begin{array}{c}
                \alpha=1 ~\left({\gamma_{\rm p}}\right) \\
                \alpha=2 ~\left({B}\right)
              \end{array}}\right.$& $\begin{array}{l}
                C\propto S^2 \\
                C\propto S
              \end{array}$\\
\hline
IC KN & $\begin{array}{l}
                C\propto R^4~B~ n^2~ \delta^4 \\
                \epsilon\propto \gamma_{\rm p}~\delta
              \end{array}$ &$C\propto\epsilon^\alpha\left\{{\begin{array}{c}
                \alpha=0 ~\left({\gamma_{\rm p}}\right) \\
                \alpha=\infty ~\left({B}\right)
              \end{array}}\right.$&$\begin{array}{l}
                C\approx{\rm const.}\\
                C\propto S^{1/2}
                \end{array}$\\
\hline
\end{tabular}
\end{table}