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The
circle tool lets you draw circles on the
surface, for example to highlight a crater. To draw a circle,
press and hold the left mouse button to mark the far point of
the circle. Release the left mouse button where you'd like the
near point of the circle to be. When you release you'll
see the circle drawn on the surface. You can Delete the circle
tool with the Delete button. Also see
the color chooser button to find
out how to draw circles of different colors.
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