= ALMA Basics by National Radio Astronomy Observatory
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{tag=Work by National Radio Astronomy Observatory}
The institutional observing guide explains interferometric Fourier sampling, the <primary beam> and synthesized resolution. Its “Imaging of extended structures” section gives the approximate $0.6\lambda/b_{\min}$ scale and explains the need for short-spacing measurements. This is an operational rule of thumb, not an exact source-independent cutoff.
https://almascience.nrao.edu/about-alma/alma-basics
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