Touchstone is a file format for storing n-port parameter data such as is used in radio frequency engineering. Touchstone was originally defined by Agilent Corporation. As of this writing, a draft Touchstone specification can be found at:

This Touchstone file loader is implemented by the "Load Touchstone File.ipf" Igor procedure file. This procedure file can load data from a single Touchstone file or from all Touchstone files in a particular directory on disk.

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