Fig. 4.
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EM loci curves for high-temperature lines of SPICE, over AR 12958. Blue rectangles on the maps denote the area over which the curves are computed. Curves of low-FIP elements are plotted with different FIP bias values (1 (photospheric), 2, 4 and 5). The intersection of the curves (especially for a FIP bias of 4) indicates an isothermal plasma around log T = 5.8. The black and green boxes in the bottom left panel are, respectively, the areas chosen to compute the DEM for the AR and QS region depicted in Fig. 5.
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