Clustering analysis of noiseless spectra with Fisher-EM. Top: convergence rate as a function of K. For every K value considered, 32 classifications were calculated. Bottom: boxplots of the ICL are a function of the number of clusters K. The horizontal bars show the median value, the boxes represent the two quartile values, the whiskers extend to points that lie within 1.5 times the interquartile range of the lower and upper quartile, and data beyond are shown individually with dots.