Unabsorbed SED of SAX J1808 from UV to X-rays obtained using simultaneous XMM-Newton/HST (STIS) observations performed during the 2022 outburst reflare phase (September 10, 2022). The HST spectrum is shown in orange from 165 to 310 nm. The pulsed UV flux is plotted with a red triangle. The total 0.5–10 keV X-ray fluxes observed by XMM-Newton are plotted using light blue points. The pulsed X-ray fluxes, plotted as dark blue squares, are calculated over the 0.5–1, 1–2, 2–3, 3–4, 4–5, 5–7, and 7–10 keV energy bands.