[Center, Axes] command generates an ellipse with the center and the two axes speified.
For the prompt
"Specify the center of the ellipse"
, specify the center of the ellipse
to genrate.
Pressing A key changes the mode to generating the ellipse on the plane that is normal to a tangent at a point of a existing curve.
Pressing C key changes the mode to specifying an rectangle for the ellipse to inscribe. The rectangle is specified by the two diagonal lines.
Pressing D key, this command acts just like [Two Axes] command.
Pressing F key, this command acts just like [Focus]
For the prompt
"Specify 1st axis direction"
, input the major axis direction, and for
the prompt
"Specify 2nd axis direciton"
, input the minor axis direction.