Dear all, I am pleased to inform you that we (the STAR GNSS RO program, see https://gpsmet.umd.edu/gnssro/index.php) have completed our initial monthly mean water vapor humidity profile data from multiple RO missions (i.e., MetOp-A, COSMIC-1, CHAMP, C/NOFS, GRACE, SAC-C, and TerraSAR-X) spanning the period from 2002 to 2014. The water vapor profiles are generated from the STAR-derived 1D var algorithm, see S.-P. Ho, Stanislav Kireev, Xi Shao, Xinjia Zhou, Xin Jing: Processing and Validation of the STAR COSMIC-2 Temperature and Water Vapor Profiles in the Neutral Atmosphere, *Remote Sens. 2022, 14(21), 5588*, DOI: 10.3390/rs14215588 <https://www.mdpi.com/2072-4292/14/21/5588>. You can download the data from https://gpsmet.umd.edu/gnssro/download_mmha.php. Let me or Dr. Xi Shao (our data manager, xi.shao@noaa.gov) know if you have any questions. Best, Ben *==============================================* *Shu-peng Ben Ho, Ph. D.* *GNSS Radio Occultation** Program Lead Scientist* *NESDIS RO Science and Quality Assessment Grant Manager* *NOAA Center for Satellite Applications and Research (STAR)* *NCWCP, E/RA-21 Office# 2824* *5830 University Research Court, * *College Park, MD 20740-3818* *Tel : (301) 683-3596* *Email: shu-peng.ho@noaa.gov <shu-peng.ho@noaa.gov>* *STAR GNSS RO Center: **https://gpsmet.umd.edu/gnssro/index.php <https://gpsmet.umd.edu/gnssro/index.php>* *STAR GNSS RO Data Service: **https://gpsmet.umd.edu/gnssro/download.php <https://gpsmet.umd.edu/gnssro/download.php>* *Publication: researchgate.net/profile/Shu-Peng-Ho/publications <http://researchgate.net/profile/Shu-Peng-Ho/publications>* *==============================================*