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Table 2

Extents (rad-1) at 50% and 10% levels of the amplitude of the complex visibility for cases such as those shown in Fig. 7, and derived half-power sizes (arcsec).

At 50% At 10% Derived sizes

2002 Aug. 27 2700 5900 31
2003 Jul. 15 1000 2000 87
2004 Aug. 14 900 2000 92
2006 Apr. 06 2500 6000 33

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