def __iter__(self):
    for (iAt, (Type, Xyz)) in enumerate(zip(self.Elements, self.Pos.T)):
        (yield FAtom(Type, Xyz, iAt))
def __iter__(self):
    for (iAt, (Type, Xyz)) in enumerate(zip(self.Elements, self.Pos.T)):
        (yield FAtom(Type, Xyz, iAt))