\begin{table}%t5 \caption{\label{table:tab5}SCUBA, MAMBO and AzTEC counterparts found in our $z\geq 3.5$~sample.} \small%\centerline { \begin{tabular}{lllllllllll} \hline \hline ID& SCUBA& MAMBO/AzTEC& $z_{\rm phot}$& $z_{\rm min 90\%}$ & $z_{\rm max 90\%}$ & $z_{\rm phot}$ & $z_{\rm radio-IR}$& $S_{850}$ & $S_{1200/1100}$ & $d$\\ (this paper)& name& name&(this paper)& & & (P06)&(D09)&[mJy]& [mJy]&[arcsec]\\ \hline \#588 &$...$ &$...$/AzGN12 &4.28 & 3.69 & 4.74 & $...$ & $...$& $...$&$3.07$&5.2 \\ \#3850 &$...$ &$...$/AzGN20N & 4.17 & 3.41 & 9.29 & $...$ & $...$&$...$&$2.79$& 2.3\\ \#5367 &$...$ &$...$/AzGN27N & 4.35 & 3.90 & 4.88 & $...$ & $...$&$...$&$2.31$& 6.5\\ \#14505 &$...$ &GN1200.9/AzGN28 & 3.56 & 2.92 & 10.06 & $...$ & $...$&$...$&$2.7/2.31$& 4.1/4.2 \\ \#522 &$...$ &GN1200.5/AzGN06 & 3.93 & 3.06 & 5.23 & $...$ & $...$&$...$&$3.8/4.13$&2.9/1.1\\ \#7785 &$...$ &GN1200.46/$...$ & 3.97 & 3.90 & 4.04 & $...$ & $...$& $...$ & 2.1$^{{a}} $&4.5\\ \#11304 &$...$ &GN1200.13/$...$ & 4.14 & 3.55 & 8.10 & $...$ & $...$& $...$&$2.2$& 0.8\\ \#6099 &GN03 &$...$ & 5.25 & 2.95 & 10.0 & 2.0 & 1.9& $1.8$& $...$&2.5\\ \#10176 &GN09 & $...$/AzGN31 & 5.818 & 3.55 & 10.0 & 2.4 & 13.42 & 8.9& 2.13& 3.9/5.3\\ \#5157 &GN11 &$...$ & 4.74 & 4.11 & 7.40 & 2.3 & 2.45 & 7.0 &$...$&2.4\\ \#8520 &GN12 & $...$/AzGN08 & 3.68 & 3.34 & 3.83 & 3.1 & 3.20& 8.6 & 3.83 &5.16/8.7\\ \#6463 &GN18 &$...$&9.437/4.215 & 3.7 & 10.0 & 2.2 & 2.50& 3.2 & $...$&3.2\\ \#15541 &GN20 & GN1200.1/AzGN01 & 3.949 & 3.69 & 4.11 & 2.95 &{\bf 4.055}&20.3& 9.3/10.69 &1.3/1.9/1.4\\ \#13857 &GN20.2a &$...$&3.746 & 3.27 & 4.04 & 2.83 & {\bf 4.051} & 9.9&$...$&6.2 \\ \hline \end{tabular}} \medskip In the columns we report: the ID number of the objects (this paper); the names from the sub-mm surveys; photometric redshift estimated in this paper and their 90\% confidence intervals; photometric redshifts by \citet[][P06]{2006MNRAS.370.1185P}; radio-IR redshifts by \citet[][D09]{Daddietal2008}~-- with the two spectroscopic values in boldface~--; the SCUBA, MAMBO and AzTEC~fluxes. The last column is the distances between the proposed IRAC-4.5~$\mu$m counterparts and the sub-mm positions. \\ $^{{a}}$ Not deboosted flux. \end{table}