MACS J1149 X-ray spectrum within R₅₀₀. Data and best-fit model are shown in black. The red, green, and blue curves indicate the cluster emission, the sky background, and the NXB, respectively. The bottom panel shows the ratio of the data to the model. Fits were performed simultaneously for all the observations, but we report only one spectrum for a clearer inspection of the plot; kT = 10.5 ± 0.3 keV and Z = 0.23 ± 0.05 Z_⊙ were obtained.