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2024-02-29 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v1.0_2017-10-25 2017-10-25 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v1.1_2017-12-20 2017-12-20 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v2.0_2018-04-13 2018-04-13 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v2.1.1_2018-08-17 2018-08-17 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v2.1_2018-07-10 2018-07-10 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v3.0_2025-03-13 2025-03-13 https://gml.noaa.gov/ccgg/globalview/data.php?id=obspack_sf6_1_v3.1_2025-07-01 2025-07-01