Normalized surface brightness profiles measured with EP-FXT and XMM-Newton. The black points represent the EP-FXT data, and the solid red line shows the best-fit double-β model, including background components. The blue points correspond to the EP-FXT surface brightness after subtraction of both the particle and sky backgrounds, fitted with a double-β model without backgrounds. The best-fit curve is shown as the solid black line, while the dashed orange and green lines indicate the two individual components of this model. The cyan points are the XMM-Newton data. The horizontal solid blue and green lines denote the particle background from fxtbkggen and sky background levels for EP-FXT, respectively, while the horizontal dashed blue and green lines indicate the particle and sky background levels for XMM-Newton.