Phase-averaged broadband spectrum of EXO 2030+375. Top: EXO 2030+375 unfolded EF_E spectrum as observed by IXPE, HXMT, and ART-XC. For plotting purpose, data from the three IXPE DUs are combined and re-normalized, and all spectra are rebinned. IXPE data are in red, HXMT LE, ME, and HE in black, blue and green, respectively, ART-XC data are in cyan. Bottom: residuals of the best-fit model (also see Table 2).