@ValidateLarchPlugin
def mu_elam(element, energy, kind='total', _larch=None):
    xdb = get_xraydb(_larch)
    return xdb.mu_elam(element, energy, kind=kind)
returns x-ray mass attenuation coefficient, mu/rho, for a
dataset/ETHPy150Open xraypy/xraylarch/plugins/xray/xraydb_plugin.py/mu_elam