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GAM file columns?

In the gam file format specification, it says it has 12 mandatory fields. But in the example it has more columns with some cigar strings. What does they stand for? (cg:Z:6M and cg:Z:7M in the example file) Example file in the link is the following

read1  6  0  6  +  >s2>s3>s4           12  2   8  6  6  60  cg:Z:6M
read2  7  0  7  +  >s2>s5>s6           11  1   8  7  7  60  cg:Z:7M
pangenome gam
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updated by Pierre Lindenbaum Pierre Lindenbaum • written by Uveyik • Uveyik

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written by Pierre Lindenbaum Pierre Lindenbaum

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https://github.com/lh3/gfatools/blob/master/doc/rGFA.md#the-graph-alignment-format-gaf

GAF is a TAB delimited format for sequence-to-graph alignments. It is a strict superset of the PAF format.

PAF : https://github.com/lh3/miniasm/blob/master/PAF.md

A PAF file may optionally contain SAM-like typed key-value pairs at the end of each line.

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written by Pierre Lindenbaum Pierre Lindenbaum

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