Intrinsic (a–c) q, (d–f) u, (g–i) PD, and (j–l) PA of Swift J1727.8−1613 in B (blue triangles; left panels), V (green diamonds; middle panels), and R (red crosses; right panels) bands in the HIMS and SIMS (errors are 1σ) assuming the IS polarization estimate using stars 2, 4, 5. The vertical dashed gray line corresponds to MJD 60206, when the ejections were detected. The gray regions in the top two rows denote the error on IS polarization at the 3σ level. The horizontal maroon dashed line in the bottom row corresponds to the jet position angle. The shaded cyan area in the bottom row corresponds to the detected X-ray PA.