2012

Delete Source Objects If you enter y, the reflected object is placed into the
drawing and the original objects are deleted. If you enter n or press Enter, the
reflected object is placed into the drawing and the original objects are retained.
Last Mirrors the selected objects about the last defined mirroring plane.
Z Axis Defines the mirroring plane by a point on the plane and a point normal
to the plane.
View Aligns the mirroring plane with the viewing plane of the current viewport
through a point.
XY/YZ/ZX Aligns the mirroring plane with one of the standard planes (XY,
YZ, or ZX) through a specified point.
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