The live TIC-6 Data Release Notes provide information on the changes from TIC Version 5 (TIC-5). Documentation on the content of the TIC can be found here. Note this documentation is specific to TIC Version 5 (TIC-5), so please refer to the release notes for the most up-to-date documentation.
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Thanks to the TESS Target Selection Working Group and TESS team members for their hard work in making this resource available! Also thanks to Scott Fleming and the team at MAST for supporting the archiving and documentation of the TIC catalogs.