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More insignificant differences. The animated GIF shows impedance for the Y21 method (no notation) and S21 method (CM suppression disabled) for a 12-turn choke on a F240-31 core. The Y axis is ohms. John, K0JHL, measured the choke with the test fixture shown in the image. It's a commercial product:



I've updated the program to create either an .s1p or .s2p file. One may fit your work flow better than the other. Each has the stray coupling or stray impedance removed.

/g/nanovna-users/files/stray.zip

Brian