Energy distributions of the Stokes parameters I, Q, and U for the bright (upper plots) and low (lower plots) states of GRO J1008–57 with the best-fit model shown with the black solid line. The residuals between the data and the model normalized for the errors are shown in the bottom panels of the corresponding plots. The different colors represent the three IXPE detectors: DU1 in blue, DU2 in orange, and DU3 in green.