Table 5: Ionic abundances from ORLs.
Ion $\lambda$ (Å) Mult I $N_{{\rm X}^{i+}}/N_{{\rm H}^+}$
He+ 4471.50 V14 5.990 1.14(-1)
  5875.66 V11 18.06 1.19(-1)
  6678.16 V46 4.234 1.05(-1)
  Average     1.15(-1)
He2+ 4685.68 3.4 4.359 3.63(-3)
C2+ 4267.15 V6 0.531 5.18(-4)
N2+ 4041.31 V39b 0.138 9.37(-4)
  4043.5290 V39a 0.087 7.69(-4)
  Average     8.53(-4)
N3+ 4379.11 V18 0.710 3.03(-4)
O2+ 4649.13a V1 0.420 8.37(-4)
  4676.24a V1 0.137 1.22(-3)
  4349.43 V2 0.305 1.62(-3)
  4072.16 V10 0.213 8.93(-4)
  4156.53b V19 0.126 1.02(-2)
  Average     1.14(-3)
a Possibly affected by absorption features from the cool stellar component (cf. Sect. 5).
b Possibly contaminated by other lines. Discarded when calculating the average ionic abundance.

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