Radio research software (formerly gr-radio_astro) contains material with several file-level license notices.
Some files specify GPL-3.0-only, others specify GPL-3.0-or-later, and retained
utility files include BSD terms. The GPL-3.0 text in LICENSE is supplied for
the GPL-covered portions of the repository; it does not replace the notices in
individual files. Those file-level notices remain the authoritative terms for
their contents.

The historical Buckhannon field-test record in docs/rfi/buckhannon-field-test-2018
and its plots in docs/images/rfi/buckhannon-field-test-2018 retain their source
attributions and notices. See that record's README.md for the template license
and original licensing status. Their inclusion does not apply the software's
GPL license to these historical documents.
