Figure 7. Cluster analyses based on a restricted set of parameters.

See text for the reasons of the restriction. The parameter considered are indicated in B. Design of the graphs is the same as in figure 6. A: The present cluster analysis suggests a distinction of four clusters (a–d) with B: specific properties. Note that there is some correspondence between this restricted analysis and the analysis given in figure 6: Cluster ‘a’ relates to cluster V; ‘b’ to I, ‘c’ to II, and ‘d’ to IV. C: The principal component analysis arranges the units in one big coherent cluster. Units establishing different clusters (C1) and different PSTH types (C2) still could not be separated.