S parameters can be saved to a file using the Touchstone (S2p) format.

A S2p file is a text file with the following format:

Each column in the file is identified as:

Frequency(MHz)   S11(dB)   S11(deg)   S21(dB)   S21(deg)   S12(dB)   S12(deg)   S22(dB)   S22(deg)

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