\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}