Spectral energy distribution of GX 340+0 in EF_E representation for the simultaneous fit using Model A of NICER (dark yellow points), IXPE (red points), and NuSTAR (blue points) observations. The different spectral model components are reported in black lines for diskbb (dashed), bbodyrad (dotted), and Gaussian (dash-dotted). The bottom panel shows the residuals between the data and the best-fit Model A. The best-fit parameters are reported in Table 3.