CO(1–0) spectral comparison of the SE filament and neighboring compact structures. The stepped spectra are displayed in 2 km s⁻¹ bins, the dashed curves show single-Gaussian fits to the 1 km s⁻¹ channels of the regridded cube, and the gray bands indicate the approximate rebinned rms. Upper left: spectra of S1–S3 extracted in matched 3″-radius apertures. Upper right: spectra of L12 and L9 averaged over their fixed SoFiA footprints. Lower left: peak-normalized single-Gaussian models for all five structures. Lower right: fitted centroids and velocity dispersions. The similar centroids of S1–S3 support their classification as a single clumpy filament. L12 has a compatible but broader and less regular profile, while L9 is redshifted and narrower. Because the extraction regions differ, absolute brightness should not be compared between the upper panels.