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Table 1:

Plasma parameters and chemical abundances obtained in the present work*. The quantities reported in each column are: Col. (1) - the PNG number; Col. (2) - the usual name of the PN; Col. (3) - the electron density deduced from the [S  II$\lambda $6717/6731 ratio; Col. (4) - the electron temperature deduced from the [O  III$\lambda $4363/5007 ratio; Col. (5) - the electron temperature deduced from the [N  II$\lambda $5755/6584 ratio (the value of $T_{\rm e}$(N  II) is in parenthesis if $T_{\rm e}$(O  III) was chosen for all ions); Cols. (6) to (12) - the He/H, N/H, O/H, Ne/H, S/H, Ar/H, Cl/H abundance ratios, respectively.
\begin{displaymath}\begin{tabular}{
r
r @{\hspace{0.20cm}}
r @{\hspace{0.05cm...
...04 & & & & 4.55E-06 & & 2.37E-06 & & & \\
\hline
\end{tabular}\end{displaymath}
* The full table is available in electronic form at http://www.aanda.org

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