Temperature and density-altitude distribution model (see Sect. 5 for details) with 6 different panels. In all panels, the best model result is represented by the red line and points. 1: n²A vs. height z given by Eq. (14). 2: Temperature T vs. z given by Eq. (15). 3: X-ray distribution at various photon energies ϵ vs. altitude. The vertical lines indicate the peak locations. 4: The model X-ray distribution peak position vs. energy (red dots) and Eq. (9) using the model T(z) and n²(z)A(z) (pink dashed-dotted line). 5: X-ray distribution widths (FWHM) vs. energy. 6: Differential emission measure, DEM(T). Panels 4–6 show both the results of the RHESSI data analysis (in blue) and the model predictions (in red). The grey areas show the range of each parameter that can adequately match the measured values using the range of modelled T(z) shown in Panel 2.