Kinematic overview of the Maggie filament. Top panel: integrated H I emission in the velocity interval between −57.5 and −48.5 km s⁻¹. The red dashed curve marks the spine of the filament. The orange line perpendicular to the spine marks the cut of the average emission profile shown in black in the upper panel of Fig. 4. Middle panel: centroid velocities of the first (or single) component derived from the GAUSSPY+ decomposition of the emission spectra. The fits are restricted to the velocity range − 71 ≤ v_LSR ≤−23 km s⁻¹. The yellow crosses mark the positions of the spectra shown in Fig. 2. Bottom panel: corresponding line widths in terms of the full width at half maximum (FWHM). Both maps are clipped at 5σ (~20 K).