Primary
Events List ○꠹｜exp｜1st｜20260107130929-00-•
cxc.harvard.edu/cdo/xray_primer.pdf
In optical/IR astronomy the primary data set is an image, while in radio interferometry it is a visibility array. In X-ray/gamma-ray astronomy—which considers the radiation at energies >50 eV—the primary data set is an events list, a table of (putative) photons.
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Secondary
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