diff --git a/fluidsim/base/preprocess/pseudo_spect.py b/fluidsim/base/preprocess/pseudo_spect.py
index 14d9e24a0d472e40f823e9bae3ea651ed49f1bf4_Zmx1aWRzaW0vYmFzZS9wcmVwcm9jZXNzL3BzZXVkb19zcGVjdC5weQ==..c14af414f8d93b4b5774e4c98d01f2d8161bef06_Zmx1aWRzaW0vYmFzZS9wcmVwcm9jZXNzL3BzZXVkb19zcGVjdC5weQ== 100644
--- a/fluidsim/base/preprocess/pseudo_spect.py
+++ b/fluidsim/base/preprocess/pseudo_spect.py
@@ -153,7 +153,7 @@
             viscosity_type,
             oper=self.oper,
             verbose=False,
-            *args
+            *args,
         )
         for v in values:
             attr, order, nu = v
@@ -280,9 +280,11 @@
     length_scale = C * np.pi / k_max
     k_f = deltak * nk_f
     large_scale = np.pi / k_f
+
+    k_diss = k_max / C / np.pi
     if verbose:
         print("Max. wavenumber =", np.pi / delta_x)
         print("Max. resolved wavenumber, k_max =", k_max)
         print("Grid spacing, delta_x =", delta_x)
         print("\nESTIMATED (P~eps)")
         print(
@@ -283,12 +285,9 @@
     if verbose:
         print("Max. wavenumber =", np.pi / delta_x)
         print("Max. resolved wavenumber, k_max =", k_max)
         print("Grid spacing, delta_x =", delta_x)
         print("\nESTIMATED (P~eps)")
         print(
-            "Kolmogorov wavenumber, k_d = ",
-            k_max / C,
-            "; k_d / k_f = ",
-            k_max / C / k_f,
+            f"Dissipation wavenumber, k_d = {k_diss}; k_d / k_f = {k_diss / k_f}"
         )
         print(
@@ -293,9 +292,6 @@
         )
         print(
-            "Kolmogorov length scale, L_d = ",
-            length_scale,
-            "; L_d / L_f = ",
-            length_scale / large_scale,
+            f"Dissipation length scale, L_d = {length_scale}; L_d / L_f = {length_scale / large_scale}"
         )
         print("Viscosity scale:", viscosity_scale, "=", args)
 
@@ -359,7 +355,7 @@
                 v.append(0.0)
 
     if verbose:
-        kolmo_len = np.mean(kolmo_len)
-        kolmo_k = np.pi / kolmo_len
+        length_scale = np.mean(kolmo_len)
+        k_diss = 1. / length_scale
         print("\nCALCULATED (eps={})".format(epsilon))
         print(
@@ -364,8 +360,5 @@
         print("\nCALCULATED (eps={})".format(epsilon))
         print(
-            "Kolmogorov wavenumber, k_d = ",
-            kolmo_k,
-            "; k_d / k_f = ",
-            kolmo_k / k_f,
+            f"Dissipation wavenumber, k_d = {k_diss}; k_d / k_f = {k_diss / k_f}"
         )
         print(
@@ -370,8 +363,5 @@
         )
         print(
-            "Kolmogorov length scale, L_d = ",
-            kolmo_len,
-            "; L_d / L_f = ",
-            kolmo_len / large_scale,
+            f"Dissipation length scale, L_d = {length_scale}; L_d / L_f = {length_scale / large_scale}"
         )
 
@@ -376,3 +366,3 @@
         )
 
-    return dict_visc.values()
+    return dict_visc