Table 2: Ionic and total abundances derived from optical lines.
  SW arc NE blob
12+log(O+/H+) 7.81 $\pm$ 0.17 7.31 $\pm$ 0.10
12+log(O++/H+) 8.00 $\pm$ 0.09 7.59 $\pm$ 0.05
12+log(O/H) 8.24 $\pm$ 0.10 7.77 $\pm$ 0.06
12+log(N+/H+) 7.00 $\pm$ 0.07 6.93 $\pm$ 0.04
log(N/O) -0.81 $\pm$ 0.21 -0.38 $\pm$ 0.12
12+log(S+/H+) 5.43 $\pm$ 0.10 5.52 $\pm$ 0.07
12+log(S++/H+) 6.47 $\pm$ 0.12 6.27 $\pm$ 0.06
12+log(S/H) 6.53 $\pm$ 0.12 6.39 $\pm$ 0.06
log(S/O) -1.69 $\pm$ 0.14 -1.38 $\pm$ 0.09
12+log(Ar++/H+) 6.11 $\pm$ 0.07 5.70 $\pm$ 0.05
12+log(Cl++/H+) ... 4.78 $\pm$ 0.13
He+/H+ (4471) 0.078 $\pm$ 0.019 ...
He+/H+ (5876) 0.077 $\pm$ 0.005 0.119 $\pm$ 0.006
He+/H+ (6678) 0.097 $\pm$ 0.006 0.083 $\pm$ 0.004
He+/H+ (7065) 0.175 $\pm$ 0.019 0.079 $\pm$ 0.010
$\langle$He+/H+$\rangle$a 0.084 $\pm$ 0.009 0.101 $\pm$ 0.018
He/H 0.091 $\pm$ 0.009 0.123 $\pm$ 0.018

a Mean value excluding He+/H+ (7065 Å).


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