New Horizons Radio Science Experiment (REX) Data Archive Bundle This bundle will contain the following collections: New Horizons REX data collections, one for each mission phase and processing level (raw and calibrated). In general these will contain tables and 1D arrays in .FIT format from the REX instrument. New Horizons REX Tracking and Navigation Files (TNF) collections, one for each mission phase. In general these may include TRK-2-34 radiometric tracking data files and TRK-2-23 media calibration files which are used be the project. See each collection's overview file for further details. This bundle was created by the Small Bodies Node (SBN) of the Planetary Data System (PDS) as part of migration from PDS3 to PDS4. The data collections from the prime mission and KEM1 extended mission found in this bundle were originally migrated from PDS3 datasets produced by the New Horizons SOC. All other extended mission data is produced by the New Horizons SOC using the PDS4 standards.