Planetary nebulae in the direction of the Galactic bulge: on nebulae with emission-line central stars

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Table 4:

Differences in dex on plasma parameters and chemical abundances adopting data from this work versus data taken from the literature. The number of analyzed PNe in common is given in parenthesis.
Sample^a	$\Delta$ log $T_{\rm e}$ (N II)	$\Delta$ log $T_{\rm e}$ (O III)	$\Delta$ log $n_{\rm e}$ (S II)	$\Delta$ log O/H	$\Delta$ log N/O	$\Delta$ log S/Ar
G	0.01 ( 8)	0.02 ( 8)	0.13 ( 9)	0.04 ( 9)	0.32 ( 9)	0.20 ( 5)
ECM	0.02 ( 9)	0.02 ( 9)	0.29 (10)	0.10 (12)	0.17 (12)	0.11 ( 7)
WL	0.02 ( 8)	0.01 ( 8)	0.06 ( 8)	0.04 ( 8)	0.18 ( 8)	0.07 ( 4)
EBW	0.08 (10)	0.04 (10)	0.13 (22)	0.19 (20)	0.27 (20)	0.15 (10)

^a Sample G includes objects in common with original PNe observations of Górny et al. (2004); sample ECM - Escudero & Costa (2001) or Escudero et al. (2004); sample WL - Wang & Liu (2007) and EBW - Exter et al. (2004).

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