Essentially
all gas seen at high galactic latitudes can be regarded as
falling toward the Milky Way disk;
to see that one has to correct each observed velocity for the
velocity of the Sun in its orbit around the Milky Way.
Moreover, any gas at large z-distance (thus being halo gas)
having zero vertical velocity
would blend in velocity with gas of the disk near the Sun.
For more on the problem see, e.g., Kaelble et al. (1985).
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
![[*]](/icons/foot_motif.gif){kind=icon}