**Table 6:** Expected limits on the CRp scaling parameter $X_{\rm CRp}$ by comparing the integrated pion decay induced $\gamma$ -ray flux above 100 GeV to sensitivity limits of Cerenkov telescopes of $\mathcal{F}_{\gamma,~{\rm exp}}(E>E_{\rm thr}) = 10^{-12}~\gamma \mbox{ cm}^{-2} \mbox{ s}^{-1} ~ (E_{\rm thr}/100 \mbox{ GeV})^{1-\alpha_\gamma}$ assuming a $\gamma$ -ray spectral index in Dermer's model $\alpha _\gamma =\alpha _{\rm p}$ . Note that limits on $X_{\rm CRp}$ roughly $\protect\la$ 0.01 for $\alpha _{\rm p}= 2.3$ in the isobaric model provide good chances to detect $\gamma$ -rays in these particular clusters with new generation Cerenkov telescopes.
$\begin{displaymath}\begin{tabular}{lccclcccl} \hline \hline \vphantom{\Large A}%... ...{-1}$ & $5.3 \times 10^{-1}$ &&&& \\ \par\hline \end{tabular}\end{displaymath}$

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