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Graphing S21 Phase after removing best fit linear?

Question asked by RZEITLER on Jul 18, 2007
Latest reply on Aug 3, 2007 by RZEITLER
I'd like to graph S21 phase in degrees after doing a linear analysis, but I'd like to subtract out a linear best fit to show deviation from linear phase.

For bonus points, I'd like the best fit to be performed on a subset of the frequency span.  So if my total analysis is from 40MHz to 80MHz, the fit should be done from 52MHz to 68MHz.

This is similar to adjusting the electrical delay reference on the HP8753ES while displaying phase.

I imagine there's an equation involved, but I can't figure it out.  And nothing obvious is popping out at me.  I'm surprised this isn't a FAQ.