Dictionary with the PAW projectors indexed by state.

def projector_functions(self):
        """Dictionary with the PAW projectors indexed by state."""
        projector_functions = OrderedDict()
        for (mesh, values, attrib) in self._parse_all_radfuncs("projector_function"):
            state = attrib["state"]
            #val_state = self.valence_states[state]
            projector_functions[state] = RadialFunction(mesh, values)

        return projector_functions