Hi everybody I have a question that I hope is not a stupid one that I was just asked it is about the etch back process. 
What does a positive etch back mean? And what does a Flush etch back mean and what is the typical spec on these? 
I know what etch back means but not up on the two of these??? Please forgive me I am just a sales guy. 
 Thank you in advance.

   Bill Dworak

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