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Fig. 2

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Oxygen abundance versus the O3N2 index for Te-based H ii regions abundances. The Te-based H ii regions are shown using different symbols and colors depending on the work they came from and the auroral line used for computing the electron temperature. The meaning of the symbols is the following: filled squares for Berg et al. (2012) data, empty circles for Bresolin et al. (2012) data, filled stars for the new CALIFA-Te data, plus signs for Crowther & Bibby (2009) data, empty upside-down triangles for Croxall et al. (2009) data, filled triangles for Guseva et al. (2012) data, filled upside-down triangles for Hadfield & Crowther (2007) data, crosses for Kehrig et al. (2011) data, filled circles for Pérez-Montero & Contini (2009) data, empty diamonds for Pilyugin et al. (2012) data, filled diamonds for Sanders et al. (2012) data, asterisks for Stasińska et al. (2013) data, empty triangles for Zahid & Bresolin (2011) data, empty squares for Zurita & Bresolin (2012) data, left pointing arrows for García-Benito et al. (2010) data, right pointing arrows for Westmoquette et al. (2013) data, filled left semi-circles for Esteban et al. (2013) data and filled right semi-circles for Monreal-Ibero et al. (2012) data. In blue we show those regions for which the temperature t3,O was computed using the [O iii] λ 4363 line; in orange those regions for which we obtain the temperature t2,N from the [N ii] λ 5755 line; in red we represent those regions for which we are able to compute the temperature t3,S using the [S iii] λ 6312, and in green are shown those regions that have both [O iii] λ 4363  and [N ii] λ 5755  measurements, so we could compute the abundance using t3,O and t2,N. The PP04 calibration is plotted with a black solid line with its applicability interval (from −1 to 1.9) shown with the vertical gray dotted lines. The PMC09 calibration is represented with a gray dashed line until its limit of validity O3N2 = 2. The gray 3-dot-dashed line shows the NAG06 calibration. The new Te-based calibration, 12 + log (O/H) = 8.533 – 0.214   ×   O3N2 is shown with a green solid line. The green dot-dashed lines encompass 2σ (=±0.36 dex) of all measurements. The vertical dashed lines indicate the interval of our fit, from O3N2 = −1.1 to 1.7. 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 abundance bins.

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