Comparison between the SPHERE-ZIMPOL polarimetric imaging data and ALMA images of W Hya. Panel (a): Color map representing the polarized intensity map obtained at 820 nm with a spatial resolution of 26 × 27 mas. The continuum-subtracted integrated intensity map of the 268 GHz H₂O line (v₂ = 2, J_Ka, Kc = 6_5, 2–7_4, 3) obtained from V_rel = −1.5 to 1.5 km s⁻¹ is plotted with the contours. The dark gray contours correspond to 3, 40, 80, 120, and 160 mJy/beam km s⁻¹, while the magenta one corresponds to −5 mJy/beam km s⁻¹. Panel (b): Color map representing the map of the degree of linear polarization obtained at 820 nm. The contours show the integrated intensity map of the 268 GHz H₂O line as in panel (a). Panel (c): Color map representing the total intensity map obtained at 820 nm. The contours represent the 268 GHz continuum image. The outermost contour corresponds to 50% of the peak intensity, which approximately marks the millimeter continuum stellar disk size. The inner three contours correspond to 97.5, 98.5, and 99.5% of the peak intensity, which show the slightly offset intensity peak.