Measurement interval | N | Period (min) ± SE |
17-23 February, 2009 | 10150 | 1448.31 ± 1.87 |
26 Sep-06 Oct, 2009 | 14396 | 1431.22 ± 10.51 |
04-25 June, 2010 | 31200 | 1435.54 ± 33.2 |
13-27 September, 2010 | 20160 | 1438.70 ± 3.31 |
10 May-05 Jun, 2011 | 36840 | 1444.03 ± 3.46 |
11-25 May, 2011 | 21600 | 1434.38 ± 2.88 |
13-21 June , 2013 | 12300 | 1449.50 ± 2.59 |
Mean | 1440.24 ± 2.69 |