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Pen Digits Data-set

**Figure A.4:** Pen digits data-set `PENDIG`. 1500 (of 7494) samples of the handwritten numerals 0-9 are plotted in gray arranged by their classes. Their mean is shown superimposed with bold black.
$\resizebox{.9\textwidth}{!}{\includegraphics*{epsexcl/data-pendig-class-2}}$

**Figure A.5:** `PENDIG` clusters. 1500 (of 7494) samples of the handwritten numerals 0-9 are illustrated arranged by clusters. Strong intra-class variation as e.g., seen in the numeral 5 is disambiguated into several clusters: 5 can be written like a 'S' in one stroke from top to bottom or in two strokes with the top dash last.
$\resizebox{\textwidth}{!}{\includegraphics*{epsexcl/data-pendig-clust-2}}$