Extracting fixture S-params by length difference

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yefj
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Hello , I have two PCB presented in the photo.
The difference between them is the length of the inner line.
I have extracted the s2p of the two of them.
I know that using the length difference we can extract the s-parameters of the rectrangular fixtures at the edges of the line.
What is the proper methematical way to do that using the S2p of these lines?
Thanks.
 

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