| FLIGHT: clock calibration using fluorescent lighting Recent countries visiting this post |  |
 | 6 | United States |
 | 6 | China |
 | 5 | |
 | 3 | Germany |
 | 1 | Italy |
| FLIGHT: clock calibration using fluorescent lighting Recent countries visiting this post | |
| 6 | United States |
| 6 | China |
| 5 | |
| 3 | Germany |
| 1 | Italy |