Table 2.
Predicted metallicity calibrations.
| Line ratio | Fit | Lower curve | Upper curve |
|---|---|---|---|
| N2 | c0=−21.818 c1 = 4.234 c2=−0.208 |
c0=−22.016 c1 = 4.250 c2=−0.209 |
c0=−21.621 c1 = 4.217 c2=−0.207 |
| R23 | c0=−41.467 c1 = 10.320 c2=−0.629 |
c0=−41.629 c1 = 10.333 c2=−0.629 |
c0=−41.305 c1 = 10.306 c2=−0.628 |
 |
c0=−42.769 c1 = 10.580 c2=−0.645 |
c0=−42.905 c1 = 10.591 c2=−0.645 |
c0=−42.633 c1 = 10.568 c2=−0.644 |
| O3N2 | c0=−26.193 c1 = 7.590 c2=−0.512 |
c0=−26.573 c1 = 7.621 c2=−0.514 |
c0=−25.813 c1 = 7.558 c2=−0.510 |
| N2O2 | c0 = 14.810 c1=−4.695 c2 = 0.335 |
c0 = 14.694 c1=−4.685 c2 = 0.334 |
c0 = 14.926 c1=−4.705 c2 = 0.336 |
Notes. Best-fitting relations for the synthetic line ratios displayed in Fig. 6 at z = 0, considering the spectra non-attenuated by ISM dust along the LoS (blue lines). The second column shows the fit parameters of our calibration (Sect. 4.2), while the third and fourth columns show the fit parameters for the lower and upper 95% confidence intervals.
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