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Interactive delay tuning help

coronas

I created a match group of nets in constraint manager -> relative delay section

When I use the delay tune command this indicator pop-up 

 

I cannot understand the meaning of these numbers and bars:

-totE is similar to total etching value but in constraint manager it says 124mm not 127mm, there is always discrepancies

-RDly shows two numbers, a negative and a positive one, what does it mean?

what is the measure unit of these numbers? 

can I change the numbers to be shown?

Thanks

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