def get_energy(self, imca=None):
        if imca is not None:
            mca = self.mcas[imca]
        else:
            mca = self.__get_mca0()
        return mca.get_energy()
get energy, optionally selecting which mca to use
dataset/ETHPy150Open xraypy/xraylarch/plugins/io/gse_mcafile.py/GSEMCA_File.get_energy