Unfolded and unabsorbed broadband spectra of Swift J1756.9–2508. Left panel: spectrum for the 2018 outburst in the 1–250 keV energy range. The data points are obtained from the combined of two XMM-Newton RGS instruments (magenta datapoints, ∼1.2–2.4 keV), XMM-Newton EPIC-MOS2 (blue points, 2–10 keV), NICER (black points, 1.5–10 keV) NuSTAR FPMA/FPMB (red and green points, 3.5–80 keV), and INTEGRAL-ISGRI (cyan points, 30–250 keV). Right panel: spectrum of the 2019 outburst in the 1.5–80 keV energy range. The data points are obtained from the NICER (black points, ∼1.5–10 keV), NuSTAR FPMA/FPMB (red and green points, 3–80 keV). In both cases, the fits are obtained with the COMPPS model, represented with a solid line. The residuals from the best fit are shown at the bottom.