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yes, no
yesodisplays a tilde (~) in front of a dimension if that dimension:
M-7 is set to display as a fraction
M-7 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)
note:the second case is a general case that does not always require a relation in order to occur.