Hinode/EIS effective-area data, used by euvst_response/eis_calibration.py.

EIS_EffArea_A.004  (long-wavelength channel, 245-292 Angstrom)
EIS_EffArea_B.004  (short-wavelength channel, 165-212 Angstrom)
EIS_EffArea_B.005  (short-wavelength channel, 165-213 Angstrom)

    Pre-flight ground-calibration effective areas, produced at MSSL in
    April 2007. Copied verbatim from SolarSoft:
    $SSW/hinode/eis/response/. IDL eis_ea.pro reads the latest of each,
    A.004 and B.005, which is B.004 with a point at 213 Angstrom added;
    eis_ltds.pro names A.004 and B.004. Column 1 is wavelength in Angstrom,
    column 2 is effective area in cm^2 with the CCD quantum efficiency
    already included.

    Lang, J. et al. 2006, Applied Optics, 45, 8689
    EIS Software Note 2, "Radiometric Calibration".

fit_eis_ea_2023-05-04_smooth.sav

    Fitted time- and wavelength-dependent effective areas from the Del
    Zanna et al. (2025) in-flight radiometric calibration, covering 2007
    to 2022. interpol_eis_ea.pro reads the unsmoothed
    fit_eis_ea_2023-05-04.sav unless given another; this is the smoothed
    one, which the accompanying README_dz2025 (kept alongside it here,
    verbatim) says to use. Distributed by Giulio Del Zanna.

    doi: 10.48550/arXiv.2308.06609

The Del Zanna (2013) spline points and the Warren et al. (2014) exponential
decay coefficients are small enough to live in the source rather than in a
data file; their provenance is recorded in eis_calibration.py.

13/08/2026, B.005 added 28/09/2026
