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File format for option -offsetfile:
The file supplied to option -offsetfile defines a mapping table named
``offsets''. It maps the sequence-regions given in the GFF3_file to offsets.
It can be defined as follows:
offsets = {
chr1 = 1000,
chr2 = 500
}
When this example is used, all features with seqid ``chr1'' will be offset by
1000 and all features with seqid ``chr2'' by 500.
If -offsetfile is used, offsets for all sequence-regions contained in the given
GFF3 files must be defined.]])
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