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creo9 Drawing Setup option documentation for: WITNESS_LINE_DELTA            

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witness_line_delta

Sets the extension distance of the witness line (1) from the dimension leader arrow.
Default and Available Settings:
0.125000* - The default value is 0.125000. You can specify a different value for the distance between the witness line and dimension leader arrow.
* 
The drawing_units Detail option determines the unit of measurement for the witness_line_delta Detail option.