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"Auxilary data" in CSI index

Sorry for question but does anybody know that does "Auxilary data" field mean in CSI specification? And consequently what does "Length of auxilary data" field mean? enter image description here

alignment

1 answer

these are metadata (a free text area), and , as far as I can see in the code

https://github.com/samtools/htslib/blob/master/hts.c#L1808

it's not used elsewhere

Thank you for help!

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