Best-fitting FASTWIND models per line determined by KIWI-GA (red) compared to the overall best-fitting FASTWIND model and 1σ uncertainties (green) in the optically thin formalism. The top and bottom rows are B11 and A11, respectively. On each axis, the main parameters of the best-fitting model of the line shown on the axis are given. For comparison, we give the parameters of the overall best-fitting model determined by KIWI-GA on the side of the figure.