See also
  Sequence identity
  show_termgaps option
Terminal gaps
A terminal gap is an alignment gap which starts in the first column 
or ends in the last column. Local alignments 
never have terminal gaps.
Internal gaps
An internal gap is any gap that is not a terminal gap. Local alignments may 
have internal gaps. 
Example
The global alignment below has terminal and internal gaps indicated. The -show_termgaps 
option was used for the ‑alnout output file. Note 
that the number of columns (302 in this example) is always reported without 
terminal gaps, as these are the columns used to calculate
identity.
