Autodesk AUTOCAD 2006, Command Reference Manual, Page: 387 / 1490

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When enough space is available for arrowheads only, places them between
the extension lines and places text outside the extension lines.
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When space is available for neither text nor arrowheads, places them
both outside the extension lines.
Arrows
Moves arrowheads outside the extension lines first, then text.
■
When enough space is available for text and arrowheads, places both
between the extension lines.
■
When space is available for arrowheads only, places them between the
extension lines and places text outside them.
■
When not enough space is available for arrowheads, places both text and
arrowheads outside the extension lines.
Text
Moves text outside the extension lines first, then arrowheads.
■
When space is available for text and arrowheads, places both between
the extension lines.
■
When space is available for text only, places the text between the
extension lines and places arrowheads outside them.
■
When not enough space is available for text, places both text and
arrowheads outside the extension lines.
Both Text and Arrows
When not enough space is available for text and arrowheads, moves both
outside the extension lines.
Always Keep Text Between Ext Lines
Always places text between extension lines. (DIMTIX system variable)
New, Modify, and Override Dimension Style Dialog Boxes | 363