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[求助] 求助blast+本地化参数问题已有1人参与

在blast+本地化的参数中，有一个是-outfmt 。6，7，10可以自带后面的内容
（Options 6, 7, and 10 can be additionally configured to produce a custom format specified by space delimited format specifiers）
The supported format specifiers are:
qseqid             means          Query Seq-id
qgi                means          Query GI
qacc                means       Query accesion
sseqid             means          Subject Seq-id
sallseqid             means          All subject Seq-id(s), separated by a ';'
sgi                means          Subject GI
sallgi                means          All subject GIs
sacc                means          Subject accession
sallacc             means          All subject accessions
qstart                means       Start of alignment in query
qend                means       End of alignment in query
sstart                means       Start of alignment in subject
send                means       End of alignment in subject
qseq                means       Aligned part of query sequence
sseq                means       Aligned part of subject sequence
evalue             means          Expect value
bitscore             means          Bit score
score                means          Raw score
length                means       Alignment length
pident                means       Percentage of identical matches
nident                means       Number of identical matches
mismatch          means          Number of mismatches
positive             means          Number of positive-scoring matches
gapopen             means          Number of gap openings
gaps                means       Total number of gaps
ppos                means       Percentage of positive-scoring matches
frames             means       Query and subject frames separated by a '/'
qframe             means       Query frame
sframe             means       Subject frame
请问在输入放入时候，怎么写  -outfmt 7  后面怎跟？
还有-num_description , -num_alig ,-max-target 这些参数的具体含义？
最主要  我想在比对结果中只留下最好的哪一个，那个参数？

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