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creo5 Drawing Setup option documentation for: ISO_ORDINATE_DELTA            

(Also MBD)

iso_ordinate_delta

Improves display of offset between an ISO-ordinate dimension line and witness line, referred to as the witness line delta.
Default and Available Settings:
no* - Does not display offset exactly in accordance with the specified value (it is "off" by about 2 millimeters).
yes - Displays offset correctly, according to value specified for the Detail option witness_line_delta.