Position-velocity diagram for ionized gas (top) and hot molecular gas (bottom) of W nucleus with positions varying along the disk major axis (PA = 257°, left, with positive distances toward west), the disk minor axis (PA = 347°, center, with positive distances toward north); and HG outflow axis (PA = 13°, right, with positive distances toward southwest). Black stars represent the stellar velocity. The zero-velocity refers to $z_W^{\ast }$.