Oxygen abundances versus N/O ratios obtained with the code developed in Pérez-Montero (2014). Each point has the errorbars delivered by the code and each point is colored according to the ionization parameter U delivered. The solid orange line indicates the relation as assumed in the D16 calibration and the blue dots correspond to the observed values for our H II regions abundances using D16. The dashed lines indicate the asymptotes for orange line, at the very high and very low O/H ratios regimes.