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Table 3

Orbit numbers and their grouping in time intervals used in the analysis.

Year January February March April

2011 108 109 111 112 113 115 116 117 118 119 120 121
2010 60 61 63 64 65 66 67 68 69 70 71 72 73
2009 13 14 15 16 17 18 19 20 21 22 23 24 25
Time Interval 1 2 3 4 5

Notes. The first and last orbits of the time intervals are given, covering approximately the same day-of-year in the different years. The blank space mark the orbits not used because of bad data quality.

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