H I spectra and  GAUSSPY+ decomposition results along the filament. The black curves show H I spectra corresponding to the positions marked in the middle panel of Fig. 3. The vertical dashed lines at − 71 and − 23 km s⁻¹ mark the velocity range taken into account for the GAUSSPY+ decomposition. The blue curve in each panel shows the first (i.e., lowest-centroid-velocity) component, which we attribute to Maggie. The gray curves show all additional components that were fit. The green curve represents the total spectrum fit in the considered velocity range.