Table 3: Summary of data remaining after pre-selection cuts.
Observation period $T_{{\rm on}}$ (min) $T_{{\rm off}}$ (min) $T_{{\rm on}}$ / $T_{{\rm off}}$

3 Oct.-18 Nov. 1301 969 1.34

2000

20 Sep.-15 Nov. 1658 1448 1.15

2001

Total 2959 2417 1.22

**Table 3:** Summary of data remaining after pre-selection cuts.
Observation period	$T_{{\rm on}}$ (min)	$T_{{\rm off}}$ (min)	$T_{{\rm on}}$ / $T_{{\rm off}}$
3 Oct.-18 Nov.	1301	969	1.34
2000
20 Sep.-15 Nov.	1658	1448	1.15
2001
Total	2959	2417	1.22

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