#NEWLINE# @ ValidateLarchPlugin #NEWLINE# def f0_ions( element = None , _larch = None ) : #NEWLINE# #INDENT# 'return list of ion names supported in the f0() calculation from\n    Waasmaier and Kirfel.\n\n    arguments\n    ---------\n    element:  atomic number, atomic symbol or ionic symbol\n              (case insensitive) of scatterer\n\n    if element is None, all 211 ions are returned.  If element is\n    not None, the ions for that element (atomic symbol) are returned\n    ' #NEWLINE# xdb = get_xraydb ( xdb ) #NEWLINE# return xdb . f0_ions ( element = element )