| Field |  | Description | 
| query |  | Query label. | 
| target |  | Target label. | 
| evalue |  | E-value calculated using
Karlin-Altschul
statistics. | 
| id |  | Percent identity. | 
| pctpv |  | Percent positives (substitution score >
0). | 
| pctgaps |  | Percent gaps. | 
| pairs |  | Number of letter pairs. | 
| gaps |  | Number of gapped columns. | 
| qlo |  | 0-based start in query. Coordinates are relative to the start of the 
sequence as it appears in the input file. | 
| qhi |  | 0-based end in query. Coordinates are relative to the start of the 
sequence as it appears in the input file. | 
| tlo |  | 0-based start in target. Coordinates are relative to the start of the 
sequence as it appears in the input file. | 
| thi |  | 0-based end in target. Coordinates are relative to the start of the 
sequence as it appears in the input file. | 
| pv |  | Number of positives (substitution score >
0). | 
| ql |  | Query sequence length. | 
| tl |  | Target sequence length. | 
| qs |  | Query segment length. | 
| ts |  | Target segment length. | 
| alnlen |  | Alignment length (columns). | 
| opens |  | Number of gap open columns. | 
| exts |  | Number of gap extension columns. | 
| raw |  | Raw score. | 
| bits |  | Bit score calculated using Karlin-Altschul statistics. | 
| aln |  | Alignment columns specified as string with M=match,
D=delete (gap in query) and I=insert (gap in target). | 
| caln |  | Compressed
alignment. | 
| qstrand |  | Query strand (+ or -). Nucleotide sequences only, | 
| tstrand |  | Target strand (+ or -). Nucleotide sequences only. This is currently always +, so 
reverse strand matches have tstrand + and qstrand -. | 
| qrow |  | Query row. Letters of the query segment with gaps
inserted as needed. | 
| trow |  | Target row. Letters of the target segment with gaps
inserted as needed. | 
| qframe |  | Query frame (-3 to +3). | 
| tframe |  | Target frame (-3 to +3). | 
| mism |  | Number of mismatch columns. | 
| ids |  | Number of columns containing identical
letters. | 
| qcov |  | Query coverage, fraction of query sequence that is
aligned  (0.0 to 1.0). | 
| tcov |  | Target coverage, fraction of query sequence that is
aligned  (0.0 to 1.0). |