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With the velocity vector and temperature of the pristine interstellar neutral(ISN) He recently obtained with high precision from a coordinated analysissummarized by McComas et al.2015b, we analyzed the IBEX observations of neutralHe left out from this analysis. These observations were collected during theISN observation seasons 2010---2014 and cover the region in the Earth's orbitwhere the Warm Breeze persists. We used the same simulation model and a verysimilar parameter fitting method to that used for the analysis of ISN He. Weapproximated the parent population of the Warm Breeze in front of theheliosphere with a homogeneous Maxwell-Boltzmann distribution function andfound a temperature of $\sim 9\,500$ K, an inflow speed of 11.3 km s$^{-1}$,and an inflow longitude and latitude in the J2000 ecliptic coordinates$251.6^\circ$, $12.0^\circ$. The abundance of the Warm Breeze relative to theinterstellar neutral He is 5.7\% and the Mach number is 1.97. The newly foundinflow direction of the Warm Breeze, the inflow directions of ISN H and ISN He,and the direction to the center of IBEX Ribbon are almost perfectly co-planar,and this plane coincides within relatively narrow statistical uncertaintieswith the plane fitted only to the inflow directions of ISN He, ISN H, and theWarm Breeze. This co-planarity lends support to the hypothesis that the WarmBreeze is the secondary population of ISN He and that the center of the Ribboncoincides with the direction of the local interstellar magnetic field. Thecommon plane for the direction of inflow of ISN gas, ISN H, the Warm Breeze,and the local interstellar magnetic field %includes the Sun and is given by thenormal direction: ecliptic longitude $349.7^\circ \pm 0.6^\circ$ and latitude$35.7^\circ \pm 0.6^\circ$ in the J2000 coordinates, with the correlationcoefficient of 0.85.

Interstellar neutral helium in the heliosphere from IBEX observations. IV. Flow vector, Mach number, and abundance of the Warm Breeze