0 0 Reserved
1 1 Past day
2 2 Present day
3 3 Mean from 24 Measurements from day before past day 23:50 UTC until past day 22:50 UTC
4 4 Mean from 3 Measurements at 06:50, 13:50 and 20:50 UTC from past day
5 5 From past day 06:30 UTC until 06:30 UTC (today)
6 6 From past day 21 UTC until 21 UTC (today)
7 7 Last 10 hours
15 15 Missing value
