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* length of this group from the leftmost position to the rightmost position, ISIZE or TLEN
* the query sequence for this alignment, SEQ
* the query quality for this alignment, [[SAM# What is QUAL?|QUAL]], one for each base in the query sequence.* Additional optional information is also contained within the alignment, [[SAM#What are TAGs|TAGs]]. A bunch of different information can be stored here and they appear as key/value pairs. See the spec for a detailed list of commonly used tags and what they mean.
==== What is a CIGAR? ====