diff --git a/CI/Determinant_space.ml b/CI/Determinant_space.ml
index 6de4d7c..aa55036 100644
--- a/CI/Determinant_space.ml
+++ b/CI/Determinant_space.ml
@@ -150,15 +150,15 @@ let fci_of_mo_basis ?(frozen_core=true) mo_basis =
     let det_alfa = Ss.spin_determinants det_a 
     and det_beta = Ss.spin_determinants det_b
     in
+    Spin (det_alfa, det_beta)
     (*
-    in Spin (det_alfa, det_beta)
-    *)
     let n_det_beta = Array.length det_beta in
     Arbitrary {
       det_alfa ; det_beta ;
       det = Array.make (Array.length det_alfa) (Array.init (Array.length det_beta) (fun i -> i));
       index_start = Array.mapi (fun i _ -> i*n_det_beta) det_alfa;
     }
+    *)
   in
   { n_alfa ; n_beta ; mo_class ; mo_basis ; determinants }