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Large radio telescope have pretty good pointing accuracy: the individual dishes of the VLA are accurate to about 10 arcsec. the giant Lovell telescope at Jodrell Bank has a similar accuracy. The second critical parameter is the beam width. Beam width depends highly on frequency: beamwidth = wave length/dish diameter When you use several dishes in an ...


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In a published scientific paper, the significance of any error bars should be explained. If this has not been clearly stated then peer review is not doing it's job. However, in some fields there may be unstated conventions which slip through without explanation. In my own field (star formation) plots which shows averages over a large data set would show ...



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