Table 2: Ionic and total abundances of IPHAS PN-1. Percentage rms errors are given within brackets.
Ion/Element Abundance 12 + log(X/H) Type Ia Type Ib
He+/H 0.076 (8)      
He2+/H 0.054 (7)      
He/H 0.130 (11) 11.11 $\pm$ 0.05 11.11[$\pm$0.016] 11.22[$\pm$0.015]
O0/H 1.06E-05 (23)      
O+/H 4.00E-05 (27)      
O2+/H 6.48E-05 (49)      
icf(O) 1.42 (13)      
O/H 1.49E-04 (34) 8.17 $\pm$ 0.15 8.65[$\pm$0.15] 8.46[$\pm$0.17]
N+/H 7.39E-05 (17)      
icf(N) 3.73 (44)      
N/H 2.76E-04 (46) 8.44 $\pm$ 0.20 8.72[$\pm$0.15] 8.50[$\pm$0.12]
Ne2+/H 5.68E-05 (59)      
icf(Ne) 2.30 (60)      
Ne/H 1.31E-04 (84) 8.12 $\pm$ 0.36 8.09[$\pm$0.15]  
S+/H 8.81E-07 (18)      
S2+/H 2.57E-06 (65)      
icf(S) 1.18 (39)      
S/H 4.07E-06 (62) 6.61 $\pm$ 0.27 6.91[$\pm$0.30] 6.55[$\pm$0.25]
Ar2+/H 5.83E-07 (35)      
icf(Ar) 1.87 (21)      
Ar/H 1.09E-06 (41) 6.04 $\pm$ 0.18 6.42[$\pm$0.30] 6.54[$\pm$0.04]
a Abundances for type I PNe from Kingsburgh & Barlow (1994). b Abundances for the three type I PNe with $D_{\rm GC}\ge 11$ kpc from Costa et al. (2004). 1-$\sigma $ dispersions of both samples are given within square brackets.

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