This field should hold the position (offset) of a sequence in an alignment, but it looks like it is never used, and only set when an alignment file is read in, and never maintained thereafter, e.g. if sequences are reordered. I suggest we delete it?
Mungo
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Mungo Carstairs
Jalview Computational Scientist
The Barton Group
Division of Computational Biology
School of Life Sciences
University of Dundee, Dundee, Scotland, UK
www.compbio.dundee.ac.uk
g.m.carstairs@dundee.ac.uk
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