Simulation Constant Fitting from Interception by two predatory fly species is explained by a proportional navigation feedback controller

The simulation error (for calculation, see methods), individually normalised for each flight, is plotted against the navigational constant (N) used in the simulation, for each of the experimental conditions (Coenosia or Holcocephala, linear or erratic targets). Mean and standard error for each panel are represented by the coloured lines and shaded areas respectively. The sensitivity of fitting N to trajectories by the alignment of simulation velocity with true fly velocity is indexed by the steepness of the slope of the mean line.