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The HEAO-3 Archive The HEAO-3 archive at HEASARC includes only raw data in native format for the HRGRS instrument. These data are available in the unbinned format as well as in 20 minute bins. HEASARC has no plans to reformat the data, but data are available in the FTP area . Documentation on data format is available only on paper. The NSSDC archive holds data from others HEAO-3 experiments in their native format. [About HEAO-3] [Archive] [Gallery] [Publications]