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Figure 2
Classification of spots for ice rings: (a) original single image; (b) spots represented by a red cross as collected from a series of images; (c) selection of spots that could be used for indexing (the `white' circle corresponds to a strong ice ring preventing any spots being found); (d) remaining unindexed spots.

Journal logoBIOLOGICAL
ISSN: 1399-0047
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