EXO 2030+375 spectral energy distribution of the phase-averaged Stokes parameters I, Q, and U as observed by IXPE – panels (a), (b), and (c), respectively. Continuous lines in the top panels represent the best-fit model const×tbabs(powerlaw×polconst) reported in Table 1. Bottom panels show the residuals. Different colors represent different detectors – black for DU1, red for DU2, and green for DU3. Data have been rebinned and re-normalized for plotting purpose.