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The center mark tool is designed to create an associative center line entity between lines or line segments.
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If you move an associated line or line segment the center line will move with the entity. However, if you move the center line separately you will disassociate it from its related entity.
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Eigenschaften
Show Extensions: Sets whether the extensions of the center line is shown or not.
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End Extension: Sets the distance the end the end of the center line will go beyond the average length of the two of the associated lines or line segments.