[V, Cr, Co, Ni/Fe] versus [Fe/H] for bulge spheroid stars. Symbols: blue pentagons show ASPCAP results for the present sample, and yellow pentagons show ASPCAP results for the sample described in Razera et al. (2022). Chemical-evolution models Different model lines correspond to the outputs of models computed for radii of r < 0.5, 0.5 < r < 1, 1 < r < 2, and 2 < r < 3 kpc from the Galactic centre. Black lines correspond to a specific star formation of ν =1 Gyr⁻¹, and blue lines show ν = 3 Gyr⁻¹; the red lines are models for ν =1 Gyr⁻¹ and original Co yields from WW95 multiplied by 2.