def scale_dict_wet(C):
    """To account for the fact that arXiv:Jenkins:2017jig uses a flavour
    non-redundant basis in contrast to WCxf, symmetry factors of two have to
    be introduced in several places for operators that are symmetric
    under the interchange of two currents."""
    return {k: v / _scale_dict[k] for k, v in C.items()}