Oxygen abundance for the subset of H II regions labelled in Fig. 8, determined with the S-strong line calibration of Pilyugin & Grebel (2016). The location of YSCs is indicated with filled circles, colour-coded based on their age (best estimates derived from the median of each PDF). Red crosses and purple stars correspond to the position of WR stars and PNe, respectively. Dark red contours indicate a ratio of [S II]/[O III] = 0.5 (see Fig. 8).