Earthdata
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Global Navigation Satellite System (GNSS) Ionosphere Vertical Total Electron Content (VTEC) Fluctuation Measurement Product from NASA CDDIS
temporal

Year	File Count
2014	440
2015	441
2016	362
2017	359
2018	318
2019	122
2020	332
2021	365
2022	170
2023	364

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