Comparison of the oxygen abundance distribution derived using the calibration proposed by M13 for the O3N2 index with the distribution derived using the P10 calibration for the ONS index (left panel) and the calibration based on pyqz code (D13, right panel). The black contours show the density distribution of the SF spaxels, the outermost one including 80% of the total number of spaxels and decreasing 20% in each consecutive contour. The black dashed lines indicate the 1:1 relation between the represented calibrators.