\begin{table}%t5 %%\centering \par \caption{\label{abun}Expected number of clusters with temperature $kT >3$~keV and with more than 1500~net counts in the 0.5--7~keV band, in each one of the three planned WFXT surveys. } \begin{tabular}{lll} \hline\hline \noalign{\smallskip} Survey & $0.5