Differential emission measure of the average quiet Sun. The input intensity of the quiet Sun is spatially averaged over the whole SPICE (and the corresponding AIA) field of view. The solid line depicts the DEM profile derived from the SPICE data. Each emission line (see Table 1) is represented with a diamond at its effective line formation temperature, as derived with the DEM procedure. The offset of each diamond to the DEM curve indicates the ratio of the observed line intensity to the one derived from the DEM. The bars represent the errors of the observed line intensities. The dotted lines display the emission measure loci for the SPICE emission lines. The dashed line depicts the DEM profile as determined using the AIA data. See Sect. 3.1.