The ASCA Data Reduction Guide by NASA HEASARC (source code)

= The ASCA Data Reduction Guide by NASA HEASARC
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https://heasarc.gsfc.nasa.gov/docs/asca/abc/abc.html

Version 2.0; also called the ABC Guide. Institutional technical source, ASCA Guest Observer Facility, NASA/Goddard. Section 4, SIS Issues: https://heasarc.gsfc.nasa.gov/docs/asca/abc/node5.html

§4.7 gives the <Fano factor>, read-noise contribution and FWHM energy-resolution expression; the numerical detector examples are ASCA-specific, not universal <CCD> specifications.