This alignment display, generated by -m 5, is similar to the alignment generated by -m 2 with one difference: partial alignments to the query are all extended or filled with dashes to generate blunt ends. See C in the figure below.
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Figure 6.3.6 Alignment (-m 5) display of a standalone blastn
search result.
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Note:
A - A deletion in the query is shown as insertion in the database sequences (after first t)
B - Deletions in the database sequences are shown as dashes
C - Regions with no alignment to the query filled in to blunt end with dashes