7th NRAO Synthesis Imaging Summer School - June 2000	Prev
	Error Recognition - S.T. Myers	Page 21
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	17	Special Problems with Snapshots:
This series of images shows a imaging session of a 30 sec A-configuration VLA snapshot of a gravitational lens at 3.6 cm. The poor uv-coverage and the weakness of the source make this difficult, but the point-source nature of the object helps the modelfitting. Above L-R: (1) uv coverage; (2) Dirty Beam; (3) Amplitude vs. uv radius; (4) A low-resolution search image to locate the source. Below L-R: (5) Dirty Image; (6) Residual after subtraction of brightest point model component; (7) Residual after second point subtraction; (8) Residual after third point subtraction.
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