Quality of all models in a GA run ranked based on the inverse of the RMSEA value as a function of the mass-loss rate. The models for these plot are based on a run trying to fit the star Sk−68 ° 41 (SpT B0.7 Ia). Each point here is a separate model where the colour defines the generation in which this model was run. The dark grey region highlights the 1-σ uncertainty interval and the light grey region is the 2-σ uncertainty.