def __init__(self, angle1, angle2, angle3, rot_order):
        # Dummy initializer for docstrings
        pass
Return center frequencies :math:`f_c`.
dataset/ETHPy150Open sympy/sympy/sympy/vector/orienters.py/SpaceOrienter.__init__--crossover with--dataset/ETHPy150Open python-acoustics/python-acoustics/acoustics/octave.py/Octave.center