Why is the result of this action the last column of the matrix?

[Passerby]

What is the output of this action, quaternion or Euler angles?

def mode(self) -> Tensor:
    return self._M[:, :, -1]

[https://github.com/stepjam/BPP/blob/main/stable_baselines_utils.py#L51](https://github.com/stepjam/BPP/blob/3a2943dac8ef1a1dc85bf19abbc2b1ffde1b76a9/stable_baselines_utils.py#L50C1-L51C33)

[midiexiangxxx]

quaternion
the last column of M is actualy the mode of Bingham distribution.