X-ray time-averaged spectra of Swift J1727.8–1613 in the dim hard state (observation 8), as obtained from IXPE DU 1, DU 2, and DU 3. We show the unfolded Stokes parameters I, Q, and U, multiplied by E², alongside the best-fit Model (1) from XSPEC. The total model is shown with solid lines for all Stokes parameters. For Stokes I, we also display the diskbb component (with dashed lines) and the powerlaw component (with dotted lines) to illustrate that the contribution of the thermal component was very low in the 2–8 keV band, according to the IXPE data. The bottom panel shows the fit residuals. The Q and U data were re-binned by energy for plotting purposes only (using the XSPEC command setplot rebin 10.0 5).