Selected groups of similar Stokes I profiles determined using k-means classification. Left: slit-reconstructed He I image centered at 10828.5 Å, in the blue wing of He I, corresponding to a Doppler shift of −50 km s⁻¹ of the He I red component. The vertical direction is along the slit. The horizontal direction is the raster-scan direction. The dark pixels represent blueshifted intensity profiles related to the erupted filament. The profiles inside the color-coded contours are shown in the right-hand panels. Right: colored spectral profiles show the average intensity profile of each group, whereas the gray profiles depict all individual profiles of each group.