def side_by_relative_angle(angle):
    """Assign side axd on relative angle centered on 0 degrees.

    Negative angles are left. Positive angles are right.
    
    Parameters
    ----------
    degrees : :obj:`float`
        Degrees centered at 180 (e.g., ranging from 0 to 360)

    Returns
    -------
    :obj:`str`
        * ``'L'`` : Left
        * ``'R'`` : Right
        * ``'C'`` : Centered
    """
    if angle < 0:
        return 'R'
    elif angle > 0:
        return 'L'
    else:
        return 'C'