Fig. E.2

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Fit peak velocity toward GMF38a. These maps show the peak velocities of fit components derived from the GAUSSPY+ decomposition of the spectra. If multiple components are present in a single pixel spectrum within the velocity range of the filament region, the component with the lowest peak velocity is shown. The black contours in both panels show the integrated GRS 13CO emission at the levels 5.0, 10.0, 20.0, and 30.0 K km s−1. The contour feature at longitude ℓ = 36° is an artifact in the observational data. Top panel: Fit HISA peak velocity. Bottom panel: Fit 13CO peak velocity.
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