Averaged MAXI J1828-249 broad-band spectrum obtained by integrating over all available Swift/XRT (black), JEM-X (red) and ISGRI (green) data from MJD 56 580 to MJD 56 594 (“total” spectrum in Table 1). The best-fit model is shown with a solid line. The two dashed lines represent the spectral components (the multi-temperature disk black-body and the power-law). Residuals from the best fit are reported in the middle (no gain correction applied) and bottom panels (after gain correction). Some instrumental residuals are still visible at energies 1.5−2.5 keV also after the gain correction but their significance is strongly reduced.