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+ 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