The average value of the height along each scan (line along X
direction) line is calculated. Then the scan lines are put upper
or lower so that in the new image the average height along each
scan line is the same. This averaging is performed using Command
Adjust Scan or button into two ways: By Selection
and In Selection . The difference
between these two ways will appear if you select in advance a
region on the surface. In Selection option will perform averaging
only in the selected region, the outer surface will not be
modified. By Selection option will average all the image according
to the data which is placed in the column, the width of which is
equal to the width of the selected area. The Button on the Tool
Bar corresponds to the option By Selection.