Updated scale dependence check when isitgr isn't called

pyccl/cosmology.py

@@ -480,11 +480,21 @@ def _build_parameters(
         c1_mg = self.mg_parametrization.c1_mg
         c2_mg = self.mg_parametrization.c2_mg
         lambda_mg = self.mg_parametrization.lambda_mg
+        gr_flag_scale_dep = 0.
 
-        if(c1_mg != 0. or c2_mg !=0. or lambda_mg != 0.):
+
+        if(c1_mg == 1. and c1_mg == 1.):
+
+            gr_flag_scale_dep = 1.
+
+        elif(c1_mg == 0. and c2_mg == 0. and lambda_mg == 0.):
+
+            gr_flag_scale_dep = 1.
 
-            if isinstance(self.mg_parametrization, modified_gravity.MuSigmaMG) and self.transfer_function_type is not 'boltzmann_isitgr':
-                raise ValueError("mu-Sigma parametrization is inconsistent with your transfer function choice (required to use isitgr)")
+        if(gr_flag_scale_dep == 0):
+
+            if isinstance(self.mg_parametrization, modified_gravity.MuSigmaMG) and self.transfer_function_type != 'boltzmann_isitgr':
+                raise ValueError("Your choice of c1_mg, c2_mg, and lambda_mg values is inconsistent with your transfer function choice (you must choose istigr).")
 
         self._fill_params(
             m_nu=nu_mass, sum_nu_masses=sum(nu_mass), N_nu_mass=N_nu_mass,