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.tenv format (east,north,up time series)
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1. station ID (SSSS)
2. date (yymmmdd)
3. decimal year
4. Modified Julian Day (MJD)
5. GPS week
6. day of GPS week (Sunday = 0, Saturday = 6)
7. delta e (m)
8. delta n (m)
9. delta v (m)
10. antenna height (m)
11. sigma e (m)
12. sigma n (m)
13. sigma v (m)
14. correlation en
15. correlation ev
16. correlation nv