“Traffic-light” diagram showing the rates of success and failure of the FIVE algorithm when disentangling a model cloud that consists of two components that overlap in position but differ in velocity. The diagram represents a matrix of pie charts, each of them showing the fraction of success (green) and failure (red) for 10 independent models with a given velocity difference between the components (in units of the spectral line FWHM, x-axis) and a maximum velocity gradient used in the definition of friend (y-axis). The horizontal box encloses the results for the favored gradient of 3 km s^-1pc^-1. (All models use a number of neighbors of 5 and an intensity threshold of 6 rms, as recommended by the results shown in Fig. A.3.)