Radio continuum image taken from the Canadian Galactic Plane Survey at 1420 MHz (top) and H i absorption profiles (bottom) of H ii regions with high radio surface brightness in comparison with the profile of an extragalactic source. It is easy to see that the entire local H i absorbs the radio continuum emission from those H ii regions with a negative systemic velocity vsys, while those with a high positive vsys are only absorbed by a part of that gas, indicating that the negative-velocity H ii regions are farther away than the high positive-velocity ones. This rules out the possibility of them being part of one big dynamically connected structure.
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