Comparison of the fitness distributions of T_eff and log of two genetic algorithm runs. The dark blue points show the models of a KIWI-GA run, the yellow points the models of a pyga run. Setup of the runs was identical: both runs had the same data (Fastwind model with simulated S/N of 30), parameter space, number of individuals, and number of generations. The left two plots show the run states after 30 generations, the right two plots after 60 generations. The ‘true values’, that is, the value of the model used for simulating the data, is indicated with a red line. Dark blue and yellow dotted lines indicate the best fit models.