The alignment overview summarizes the BLAST result graphically. This is activated using 'SHOW_OVERVIEW=on'. An annotated Overview is shown in the figure below. Generally this is not relevant to script assisted search through BLAST URLAPI.
|Figure 6.8 Overview graphic displayed with 'SHOW_OVERVIEW=Yes'.|
The above overview graph displays the HSPs found in a sample search. The distribution of those HSPs on the query is indicated by the position of the horizontal bars, whose color represents the alignment quality. HSPs from the same database sequence are linked by thin line. We can see summary information on a given database match by mousing over its bar.