Oxygen abundance versus the O3N2 index for the H ii complexes detected within the CALIFA galaxies. For the sake of clarity we plot the CALIFA-ONS H ii regions as a blue density contour plot. Our new O3N2 calibration (see Fig. 2) is plotted with a green solid line. Red lines are used to show the CALIFA-ONS best linear fit (solid) and its 2σ prediction intervals (dot-dashed) with its applicability interval (from −1.1 to 1.7, vertical dashed lines) (see text for details on these fits). In this case we obtain 12 + log(O/H) = 8.505 – 0.221 × O3N2. The blue cross and bar in the top right corner of the plot indicate the average random errors (cross) of the CALIFA-ONS data points and the typical systematic errors (vertical bar) associated with the measurement of ionized-gas oxygen abundances.
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