
In the above maps you see the intensity of missing dots on printed paper (right side) and the values of a special parameter of the printing process (left). One sees that there is a region of correlation in the left/down corner but the many-missing-dots region in the center has no correspondence at this parameter (it might at another process parameter). One could imagine to have a monitoring board where all process parameters and quality parameters are represented as SOM und you control your process by staying in the high-quality regions of your quality parameters.
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