Table 2: Summary of the observation periods.
Observation Date $T_{{\rm on}}$ (min) $T_{{\rm off}}$ (min)

03-Oct. - 18-Nov. 2000 2297 2245

20-Sep. - 15-Nov. 2001 2567 2401

Total 4864 4646

**Table 2:** Summary of the observation periods.
Observation Date	$T_{{\rm on}}$ (min)	$T_{{\rm off}}$ (min)
03-Oct. - 18-Nov. 2000	2297	2245
20-Sep. - 15-Nov. 2001	2567	2401
Total	4864	4646

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