Positioning the cursor over a plotted point will cause its codon and position to appear in the information line.
It is possible to find the distance between any two stop codons. Pressing the left mouse button on a plotted point will display "Select another codon" at the bottom of the window. Then, pressing the left button on another plotted point will display the distance, in bases, between the two sites. This is shown in the box located at the top right corner of the window.
If the Contig Editor (see section Editing in gap4) is currently running on the same contig as is being displayed as a Stop Codon Map, the Refresh button will be shown in bold lettering and hence be active, otherwise it will be greyed out. Pressing the button will fetch the current consensus from the Contig Editor and replot its stop codons. Hence the plot can be kept current with the changes being made in the editor.