Comparison of the best-fit model with the Q_ϕ image. Panel a: Image visualizing the dust distribution in the disk. Panel b: Model image of the polarized light non-convolved with PSF. Panel c: Model image of the polarized light convolved with the instrumental PSF. Panel d: Q_ϕ image from the data. The rectangular area outlined with an orange box shows the minimization window as described in the body text. The orange circle marks the central region of the image excluded from the χ² evaluation. Panel e: Residual image obtained after subtraction of the PSF-convolved model image (c) from the Q_ϕ image (d). Color-scales of images (a) and (b) are given in arbitrary units. The color-bar for images (c, d) and (e) shows polarized flux in counts per binned pixel.