Abundance errors associated with the uncertainties in effective temperature (upper left), surface gravity (upper right), metallicity (lower left) and microturbulence (lower right). A change of  ± 200 K was applied to T_eff,  ±0.1 dex to [Fe/H],  ±0.3 dex to log g and  ± 0.2 dex to ξ. Model atmosphere were then created and abundances were re-determined. Filled circles show the change in abundance as Δ[X/Fe] = [X/Fe] − [X/Fe]_±Δ when changes were added to the original parameters. Empty circles show the change in abundance when the respective value is subtracted. Dashed lines show the mean variations σ₍₊₎ and σ₍₋₎ when the uncertainty in the stellar parameter is added and subtracted respectively.