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Figure 9
In order to encode the boundary, a number is associated with each of the eight possible directions as shown in (a). In (b) an example of a boundary is shown for which the chain code is given in the text. The starting point for the chain code is indicated by a black spot.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 58| Part 11| October 2002| Pages 1907-1914
doi:10.1107/S0907444902016633
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