Differential emission measure (DEM) diagnostics of the two upflow regions. Panels (a) and (b) show the results in the eastern upflow region, and panels (c) and (d) are from the western region (see contours in Figure 3). Column emission measure EM_T(T) = DEM(T)ΔT was inferred by an MCMC approach. The upper panels show the best-fit EM_T in solid lines and the median EM_T of 1000 batches in dashed lines. The shaded areas outline the confidence bounds of the MCMC inference. The EM loci (I_obs/G(T_e)) curves of the input lines are also shown above the EM_T curves. The bottom panels show the ratios between the observed line intensity I_obs and expected line intensity I_exp modeled by the best-fit DEM, as a function of the DEM-weighted effective formation temperature. Link to the Jupyter notebook creating this figure: 📘.