@ValidateLarchPlugin
def f1_chantler(element, energy, _larch=None, **kws):
    xdb = get_xraydb(_larch)
    return xdb._getChantler(element, energy, column='f1', **kws)
returns real part of anomalous x-ray scattering factor for
dataset/ETHPy150Open xraypy/xraylarch/plugins/xray/xraydb_plugin.py/f1_chantler