\begin{table}%t2 \caption{\label{tab:molecules}Species and number of detected lines in the 555$-$636~GHz.}\vspace{-2mm} %\centering \par \begin{tabular}{l|c|rrrrr} \hline \hline Species & $E_{\rm up}$ (K) & (1) & (2) & (3) & (4) & (5) \\ \hline H$_2$O & 27--680 & 1 & 2 & 1 & 1 & 2\\ HDO & 97 & 0 & 1 & 0 & 0 & 1\\ D$_2$O & 29 & 0 & 1 & 0 & 0 & 0\\ CO & 83 & 1 & 1 & 1 & 1 & 1\\ C$^{17}$O & 83 & 0 & 1 & 1 & 1 & 1\\ HCO$^+$ & 119 & 1 & 1 & 1 & 1 & 1\\ H$^{13}$CO$^+$ & 119 & 0 & 1 & 0 & 0 & 1\\ HCN & 119 & 1 & 1 & 1 & 1 & 1\\ H$^{13}$CN & 119 & 0 & 1 & 1 & 0 & 1\\ DCN & 119 & 0 & 1 & 0 & 0 & 1\\ HNC & 119 & 0 & 1 & 1 & 0 & 1\\ CN & 82 & 0 & 0 & 2 & 2 & 2\\ N$_2$H$^+$ & 95 & 0 & 1 & 1 & 0 & 1\\ NH$_3$ & 28 & 1 & 1 & 1 & 1 & 1\\ HCl & 27 & 0 & 1 & 1 & 1 & 1\\ H$^{37}$Cl & 27 & 0 & 1 & 1 & 0 & 1\\ CCH & 117 & 0 & 0 & 2 & 0 & 2\\ H$_2$CO & 120--530& 4 & 8 & 8 & 0 & 8\\ CH$_3$OH & 39--1050 & 17 & 35 & 47 & 3 & 345\\ $^{13}$CH$_3$OH & 39--240 & 0 & 0 & 0 & 0 & 41\\ CH$_3$OCH$_3$ & 115--290 & 0 & 0 & 1 & 0 & 30\\ H$_2$S & 160--415 & 0 & 2 & 0 & 0 & 4\\ CS & 186 & 1 & 1 & 1 & 1 & 1\\ C$^{34}$S & 175--200 & 0 & 2 & 0 & 0 & 2\\ SO & 190--225 & 0 & 6 & 0 & 2 & 6\\ SO$_2$ & 80--210 & 0 & 10 & 0 & 0 & 15\\ \hline others$^c$ & & 0 & 0 & 0 & 0 & 62 \\ \hline Total & & 27 & 86 & 71 & 16 & 558\\ \hline \end{tabular} \tablefoot {Second column gives the upper level energy range of the detected transitions. Columns~(1) to~(5) refer to L1157-B1, IRAS~16293, OMC2-FIR4, AFGL~2591 and NGC~6334I respectively. In L1157-B1 the number refers to the list of lines reported in Codella et~al. (\cite{Code10}).} \vspace*{-4mm} \end{table}