Figure 4.

Visualization of one-dimensional self-organizing map according to cluster size. Alternative view of 1D-SOM matrix after metabolite-based clustering with 33 prototypes. The horizontal and vertical dimensions correspond to prototypes and experimental conditions, respectively. The color of matrix elements represents (average) intensity values according to the color map on the right hand side. The width of the matrix column for each prototype is proportional to the number of marker candidates assigned to this prototype.