\begin{table}%t1 \caption{\label{tab1}List of analyzed PNe. } \small%\centering \par \begin{tabular}{ l @{\hspace{0.40cm}} l @{\hspace{0.40cm}} c @{\hspace{0.40cm}} c @{\hspace{0.60cm}} c @{\hspace{0.20cm}} c @{\hspace{0.20cm}} c} \hline \hline\noalign{\smallskip} PN G & Name & Pop. & Ref. & \multicolumn{3}{c}{IR spectra} \\ & & & & PAH & SiO cr. & SiO am. \\ \hline \DCcr: & & & & & & \\ \noalign{\smallskip} 000.1+04.3 & H 1-16 & b & P & + & + & -- \\ 007.2+01.8 & Hb 6 & d & P & + & + & -- \\ 354.2+04.3 & M 2-10 & b & G & + & + & -- \\ 358.7-05.2 & H 1-50 & b & P & + & + & -- \\ \noalign{\smallskip} 358.9+03.2 & H 1-20 & b & G & + & + & -- \\ \DCacr: & & & & & & \\ \noalign{\smallskip} 354.5+03.3 & Th 3-4 & b & P & + & + & + \\ 356.9+04.4 & M 3-38 & b & P & + & + & + \\ 358.2+04.2 & M 3-8 & b & P & + & + & + \\ \noalign{\smallskip} 359.7-02.6 & H 1-40 & b & P & + & + & + \\ \OCacr: & & & & & & \\ \noalign{\smallskip} 002.2-02.7 & M 2-23 & b & P & -- & + & + \\ 008.2+06.8 & He 2-260 & d & P & -- & + & + \\ 355.6-02.7 & H 1-32 & b & P & -- & + & + \\ 355.7-03.5 & H 1-35 & b & P & -- & + & + \\ \hline \end{tabular} \tablefoot{The Galactic bulge (b) or disk (d) association of the object is marked in Col.~3. The reference to original observers is given in Col.~4. Objects are divided into three groups according to their infrared properties as marked in Cols.~5--7 (see description in Sect.~3).}\vspace{-2mm} \tablebib{G -- Gutenkunst et~al. (2008); P -- Perea-Calder{\'o}n et~al. (2009).} \end{table}