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creo6 config.pro option documentation for: MARK_APPROXIMATE_DIMS            


mark_approximate_dims

yes , no *
yes - Displays a tilde (~) in front of a dimension if that dimension:
Is set to display as a fraction
Has an actual value that has not been rounded to equate exactly to the displayed fractional value (in other words, the fraction shows 7/32 but the actual value is .22, not 0.21875)
 
* The second case is a general case that does not always require a relation in order to occur.