  Integral field spectroscopy of the inner region of the Galactic Center, over
a field of roughly 40"x40" was obtained at 2.06 microns (He I) and 2.16 microns
(Brackett-gamma) using BEAR, an imaging Fourier Transform Spectrometer, at
spectral resolutions respectively of 52.9 km/s and 21.3 km/s, and a spatial
resolution of ~0.5". The analysis of the data was focused on the kinematics of
the gas flows, traditionally called the "Minispiral", concentrated in the
neighborhood of the central black hole, Sgr A*. From the decomposition into
several velocity components of the line profile extracted at each point of the
field, velocity features were identified. Nine distinguishable structures are
described: the standard Northern Arm, Eastern Arm, Bar, Western Arc, and five
additional, coherently-moving patches of gas. From this analysis, the Northern
Arm appears not limited, as usually thought, to the bright, narrow North-South
lane seen on intensity images, but it instead consists of a weak, continuous,
triangular-shaped surface, drawn out into a narrow stream in the vicinity of
Sgr A* where it shows a strong velocity gradient, and a bright western rim. The
Eastern Arm is split into three components. We also report extinction of some
interstellar structures by others, providing information on their relative
position along the line of sight. A system of Keplerian orbits can be fitted to
most of the Northern Arm, and the bright rim of this feature can be interpreted
in terms of line-of-sight orbit crowding caused by the warping of the flowing
surface at the western edge facing Sgr A*. The question of the origin of the
ionized gas is addressed and a discussion of the lifetime of these features is
presented.
