Mosaic of Hα (top) and Na i D2 (bottom) Doppler velocities corresponding to the slit-reconstructed images in Fig. 3. The velocities were inferred from the line core fits. The mosaics were rotated to place the filament in a horizontal position. The superimposed black contours mark the outer boundaries of the filament as seen in Hα line core images. Doppler velocities were clipped between ±2 km s-1.
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