def METHOD_NAME(self):
    obj = self.df
    for subset in [
        "REE",
        "REY",
        "elements",
        "oxides",
        "isotope_ratios",
        "compositional",
    ]:
        with self.subTest(subset=subset):
            setattr(obj.pyrochem, subset, getattr(obj.pyrochem, subset) * 1.0)