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Fig. 4

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Oxygen abundance versus the N2 index for the Te-based H ii regions. The symbols and the color code are the same as for Fig. 2. The PP04 calibration is plotted with a black solid line with its applicability interval (from N2 = −2.5 to −0.3) shown with vertical gray dotted lines. The PMC09 calibration is represented with a gray dashed line, while the gray 3-dot-dashed line shows the NAG06 calibration. The new Te-based calibration, 12 + log (O/H) = 8.743 +0.462 × N2, is shown with a green solid line, while the green dot-dashed lines encompass 2 σ (±0.32 dex) of the measurements. The vertical dashed lines indicate the interval of our fit, from N2 = −1.6 to −0.2. We only plot in blue the errors associated to the new measurements of the CALIFA-Te H ii regions. For the sake of clarity we show on the right the average random error associated to the computation of the oxygen abundances for different metallicity bins.

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