Left panels: Deprojected Hα emission-line maps of UG101 (top) and UG103 (bottom), in polar coordinates. The angular coordinate (ϕ) starts from the north direction and increases counterclockwise. Only spaxels with S/N ≥ 4 are displayed, and stars are masked. Positions are marked along the spiral arms of each galaxy (“x” marks). The inclination of the curve connecting these points was computed to measure the pitch angle of each spiral arm, and the red curves show the smoothed fit. The horizontal cyan line marks 2 R_e. Right panels: Color-composite images of each galaxy with re-projected positions overlaid to highlight the unwound spiral arms. The dashed cyan line shows the elliptical isophote with a semimajor axis equal to 2 R_e. In all panels, the orange text marks the labels assigned to each identified spiral arm.