\begin{table}%T3 \par \caption{\label{lf15.tab}15~$\mu$m luminosity function values.} \small%\centering \par \begin{tabular}{cccccccccccc} \hline\hline\noalign{\smallskip} ${\rm log}(L_{15}/L_\odot)$ & 8.25 & 8.75 & 9.25 & 9.75 &10.25& 10.75& 11.25 &11.75 &12.25 &12.75 &13.25\\ \hline $ 0.00