This alignment display, generated by -m 6, is similar to the alignment generated by -m 4 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 6.1.3.5 Pairwise alignment (-m 6) display of a standalone
blastn search result.
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Note:
A - Alignment gaps in the query
B - Alignment gaps in the database sequence
C - Dash files the regions with no alignment to the query