code: def X2_chain_omega_mh2(self, args):
          
          H0 = args[0]
          h = H0/100.
          omega_m = self.omega_mh2_fixed / h**2
          Ode0 = self._omega_lambda_fixed
          logL, bool = self.prior_omega_mh2(h, omega_m)
          if bool is True:
              logL += self.LCDM_lensLikelihood(H0, omega_m, Ode0)
          return logL, None
docs: routine to compute the log likelihood given a omega_m h**2 prior fixed
          :param args:
          :return: