Official website page: NASA's OSIRIS-REx Speeds Toward Asteroid Rendezvous

The map shows the spacecraft path across the Earth's surface.

The altitude (shown in km as "h= ..." when you hover the mouse over a point) is calculated above an ellipsoid with an equatorial radius of 6378.1366 km and a polar radius of 6356.7519 km.
The label also shows "V_ECEF" that is the Earth-Centered, Earth-Fixed spacecraft speed (the origin of the axes is at the Earth's barycenter and the axes rotate with the Earth).

The graph shows the spacecraft and the Moon's paths.

The first 18 points are plotted with a smaller step size.

The graph shows the spacecraft altitude and speed.
This time the speed is given in the Earth-Centered Inertial reference frame.