def METHOD_NAME(sigma0, Rs, q):
    """Mapping to eqn 10 and 11 in Oguri 2021 from phenomenological definition.
    :param sigma0: sigma0 normalization
    :param Rs: scale radius
    :param q: axis ratio
    :return: normalization (m)
    """
    rs_ = Rs / np.sqrt(q)
    const = sigma0 / 2 * rs_**3
    return const