**Table 1:** Feature identifications, with surface areas (pixels and square arcseconds), and minimum and maximum radial velocities (km s^-1). The last column gives [He I]/[Br $\gamma$ ] for the different structures, relative to the mean value $\langle$ [He I]/[Br $\gamma$ ] $\rangle$ . The Minicavity is separated from the Northern Arm, as it warrants special attention.
ID	Feature name	S (pix)	S (arcsec²)	Vmin	Vmax	[He I]/[Br $\gamma$ ]^a
a	Northern Arm	2414	300.8	-290	186	0.74^b
	Minicavity					0.85
b	Bar	1389	173.1	-214	194	0.99
c	Ribbon	833	103.8	130	240	0.78
d	Eastern Bridge	670	83.5	32	180	1.09
e	Western Arc	471	58.7	-40	72	0.52
f	Western Bridge	327	40.7	-124	98	1.73
g	Tip	207	25.8	220	336	2.64
h	Northern Arm Chunk	185	23.1	12	72	-
i	Bar Overlay	136	16.9	-270	-10	1.81

^a Normalized to its mean value.
^b Except Minicavity.

Source LaTeX | All tables | In the text