Class map summary for the Fisher-EM analysis of NGC 4151 with the classification into nine classes (reddish colours) and the subclassification of class 1 into 11 classes (blueish colours). The red class 1 is replaced by its subclassification and hence does not appear on this map. The white spaxels were removed because the automatic alignment failed. The class nomenclature is explained in Fig. 1.