Import resistivity magnitude/phase and real/imaginary part of
        conductivity for all iterations

def _read_inversion_results(self, tomodir):
        """Import resistivity magnitude/phase and real/imaginary part of
        conductivity for all iterations
        """
        basedir = tomodir + os.sep + 'inv' + os.sep
        print(basedir)
        inv_mag = sorted(glob(basedir + 'rho*.mag'))
        inv_pha = sorted(glob(basedir + 'rho*.pha'))
        inv_sig = sorted(glob(basedir + 'rho*.sig'))

        assert len(inv_mag) == len(inv_pha)
        assert len(inv_mag) == len(inv_sig)

        pids_mag = [self.parman.load_inv_result(filename) for filename in
                    inv_mag]
        pids_pha = [self.parman.load_inv_result(filename) for filename in
                    inv_pha]
        pids_sig = [self.parman.load_inv_result(filename, columns=[0, 1]) for
                    filename in inv_sig]
        self.assignments['inversion'] = {
            'rmag': pids_mag,
            'rpha': pids_pha,
            'cre_cim': pids_sig,
        }