diff --git a/DiffractionGratings/grating3D_postplot_Mmatrix.py b/DiffractionGratings/grating3D_postplot_Mmatrix.py
index 4b7269304160f58c377882e8391678d54e8738af..96f16978689e5ffdc3854fb2645beec436bdf6a3 100644
--- a/DiffractionGratings/grating3D_postplot_Mmatrix.py
+++ b/DiffractionGratings/grating3D_postplot_Mmatrix.py
@@ -23,8 +23,8 @@ def load_getdp_integral(fname):
     else:
         return temp[:,1]+1j*temp[:,2]
 
-nb_lam = 20
-nb_phi = 21
+nb_lam = 50
+nb_phi = 51
 FLAG_TOT = 0
 respath  = 'res_Matrix_nb_lam%g_nb_phi%g_total0/'%(nb_lam,nb_phi-1)
 rpp = np.zeros((nb_lam,nb_phi),dtype=complex)