Unwrapping Phase

Does anyone know of a quick way to unwrap the phase within the data display. Say I have a long 50ohm phase line to create a delay that is 410 degrees long. As is the data display will display a phase of -50 degrees. I want to unwrap the phase so that it will display the actual 410 degrees.

In the data display define an equation like:

a = unwrap(phase(S21))

and plot that instead of just phase(S21).

I couldn't get those formulas to work in the past but I believe I've found my error. I was analyzing the phase shift at 2655MHz and only simulating from 2620 to 2690MHz (within band), which I now know that's not a large enough window. When I simulate from 0 (DC) to 3000MHz the formulas work correctly.

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