Table 3: Element abundances.
  SDSS   3.6 m
Property J0113+0052a   J2104-0035N J0113+0052
$T_{\rm e}$(O III), K 22 520 $\pm$ 7360   20 060 $\pm$ 620 22 880 $\pm$ 2990
$T_{\rm e}$(O II), K 15 480 $\pm$ 4510   15 610 $\pm$ 450 15 410 $\pm$ 1780
O+/H+, ($\times$105) 0.567 $\pm$ 0.421   0.182 $\pm$ 0.016 0.575 $\pm$ 0.179
O2+/H+, ($\times$105) 0.836 $\pm$ 0.593   1.630 $\pm$ 0.116 0.906 $\pm$ 0.256
O/H, ($\times$105) 1.403 $\pm$ 0.727   1.812 $\pm$ 0.117 1.481 $\pm$ 0.313
12 + log O/H 7.15 $\pm$ 0.23   7.26 $\pm$ 0.03 7.17 $\pm$ 0.09
N+/H+, ($\times$107) 2.479 $\pm$ 2.041   ... ...
ICF(N) 2.49   ... ...
N/H, ($\times$107) 5.662 $\pm$ 5.049   ... ...
log N/O -1.39 $\pm$ 0.45   ... ...
Ne2+/H+, ($\times$106) 2.542 $\pm$ 1.649   2.794 $\pm$ 0.211 2.624 $\pm$ 0.771
ICF(Ne) 1.17   1.04 1.17
Ne/H, ($\times$106) 2.981 $\pm$ 2.768   2.914 $\pm$ 0.235 3.058 $\pm$ 1.260
log Ne/O -0.67 $\pm$ 0.46   -0.79 $\pm$ 0.05 -0.69 $\pm$ 0.20
a O+/H+ is obtained adopting the [O II] $\lambda$3727 emission line flux
from the 3.6 m observations.

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