SET EXTRACTION APERTURES

?	Display commands
a	Set the aperture number for the current aperture
l	Set the lower limit at the cursor for the current aperture
u	Set the upper limit at the cursor for the current aperture
y	Set the aperture limits at the Y cursor positions for the
	    aperture nearest the X cursor
+	Make the next aperture to the right the current aperture
-	Make the next aperture to the left the current aperture
.	Make the nearest aperture to the cursor the current aperture

The following colon commands set or show various parameters.

:show [file]		Show or record the apertures
:aperture [number]	Show or set aperture number
:lower [value]		Show or set aperture lower limit
:upper [value]		Show or set aperture upper limit

:.help	Display cursor mode commands
:/help  Display formating commands