| NDSA Measurements between Two LEO Satellites in Ku and K Bands for the Tropospheric Water Vapor Estimate: Performance Evaluation Recent countries visiting this post |  |
 | 6 | United States |
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| NDSA Measurements between Two LEO Satellites in Ku and K Bands for the Tropospheric Water Vapor Estimate: Performance Evaluation Recent countries visiting this post | |
| 6 | United States |
| 1 | China |
| 1 | |
| 1 | Russian Federation |