Fig. 2
The estimation of the off-limb contribution to the total irradiance for a selection of lines: the “chromospheric” He i 584 Å, the transition-region (~0.25 MK) O v 630 Å, the “coronal” (~1 MK) Mg x 625 Å, and the “hot” (~2.5 MK) Fe xvi 361 Å, in addition to the two second-order lines Si xi 303 Å and He ii 304 Å. Images are negative. The solar images and the histograms are displayed in logarithmic scales.
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