def colourfulness_components(C_RG, C_YB, B_rw):
    """
    Returns the *colourfulness* components :math:`M_{RG}` and :math:`M_{YB}`.

    Parameters
    ----------
    C_RG : numeric
        *Chroma* component :math:`C_{RG}`.
    C_YB : numeric
        *Chroma* component :math:`C_{YB}`.
    B_rw : numeric
        Ideal white *brightness* correlate :math:`B_{rw}`.

    Returns
    -------
    numeric
        *Colourfulness* components :math:`M_{RG}` and :math:`M_{YB}`.

    Examples
    --------
    >>> C_RG = -0.0028852716381965863
    >>> C_YB = -0.013039632941332499
    >>> B_rw = 125.24353925846037
    >>> colourfulness_components(C_RG, C_YB, B_rw)  # doctest: +ELLIPSIS
    (-0.0036136..., -0.0163312...)
    """

    M_RG = C_RG * B_rw / 100
    M_YB = C_YB * B_rw / 100

    return M_RG, M_YB