Element abundance ratios, relative to O, as predicted for model M1R compared to observed values from recombination lines for the H ii region HV as presented in Peimbert et al. (2005) and the adopted values for PNe, as explained in Sect. 5.1. O and C abundances in HV was corrected for dust depletion, as explained in Sect. 4.1. H ii region HV is presented in magenta filled circles, young-PNe are represented by green filled squares and old-PNe, by blue filled triangles. The open squares are the two type-I PNe and the open triangle is PN6 (see HPCG09). The magenta filled star, in the Fe/O panel, represents the value derived by Venn et al. (2001) for A-type supergiant stars.