code: def _get_crmod_abmn(self):
          
          ABMN = np.vstack((
              self.configs[:, 0] * 1e4 + self.configs[:, 1],
              self.configs[:, 2] * 1e4 + self.configs[:, 3],
          )).T.astype(int)
          return ABMN
docs: return a Nx2 array with the measurement configurations formatted
          CRTomo style