Left: 1991 pre-COSTAR HST/FOC observation of LK-Hα-233 resampled according to the Nyquist–Shannon sampling theorem (i.e., 2 × 2 pixels² or 0.0287 × 0.0287 arcseconds²), to ensure individual pixels yield meaningfully polarization measurements. The total flux is color-coded and expressed in units of erg cm⁻² s⁻¹ Å⁻¹. Polarization vectors are displayed for [S/N]_P ≥ 3, although at this spatial resolution they are difficult to resolve visually (larger images are presented in the appendices). Total flux contours are displayed for 0.8%, 2%, 5%, 10%, 20%, and 50% of the maximum flux. In the top-left corner, we indicate the total flux F, polarization degree P, and polarization angle θ values, integrated over the whole field of view (7 × 7 arcseconds² in this image). Following the IAU convention, north is up and the polarization angle positively rotates toward the east. Right: Same image but with a spatial binning of 0.1 arcsecond per pixel. The polarization pattern highlighted by the vectors becomes more apparent at this scale.