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We present a quick-start guide to BOND, a statistical method to derive oxygenand nitrogen abundances in H II regions. BOND compares a set of carefullyselected strong and semistrong emission lines to a grid photoionization models.The first novelty, in comparison to other statistical methods, is that BONDrelies on the [Ar III]/[Ne III] emission line ratio to break the oxygenabundance bimodality. In doing so, we can measure oxygen and nitrogenabundances without assuming any a priori relation between N/O and O/H. Thesecond novelty is that BOND takes into account changes in the hardness of theionizing radiation field, which can come about due to the ageing of H IIregions or the stochastically sampling of the IMF. We use the emission lineratio He I/Hb, in addition to commonly used strong lines, to constrain thehardness of the ionizing radiation field. Finally, we also stress the pragmaticconsiderations behind our Bayesian inference.

A quick start guide to BOND: Bayesian Oxygen and Nitrogen abundance Determinations in H II regions using strong and semistrong lines