Combining several deembeding methods to make a more acurate result for s-parameters

[yefj]

Hello , I have built a script by the method described in the article.
it has dut with two fixtures on both side.

I have fixture-X_length-fixture and fixture-2X_length-fixture
what is the best strategy to extract the sparams of the dut.
the optical article is good and it uses only one s2p instead of two.
What is the best way to do deembeding?
Thanks.