Fig. 2.

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VLA spectrum of all detected H I emission (solid black line) within the primary beam. The light grey shading around the black line indicates the uncertainty based on the rms noise and the number of pixels included in the source mask for a given channel. The vertical dotted lines indicate the velocities of group member galaxies. Regions of the spectrum where all values are exactly zero indicate spectral ranges where there are no pixels in the source mask.
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