Volume DEM distribution of the quiet Sun. The points indicate the ratio of the predicted vs. observed irradiance, multiplied by the DEM value at the effective temperature. The labels indicate the wavelength (Å) and the main ion. The red line indicates the DEM obtained from the CDS NIS measurements of 2008 Sept 22, while the green line the DEM obtained from the active Sun using the Malinovsky & Heroux (1973) irradiances.
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