diff --git a/lib/integrator.py b/lib/integrator.py
index cc3a70b..060d07e 100755
--- a/lib/integrator.py
+++ b/lib/integrator.py
@@ -6,7 +6,6 @@ Implementation of the various integrators for numerical integration.
 Comes from the assumption that the problem is analytically defined in position-momentum (q-p) space for a given hamiltonian H.
 """
 from os import system
-import time
 import numpy as np
 from lib.plots import DynamicUpdate
 
@@ -74,7 +73,7 @@ def frogleap(duration, step, dyn_syst, recover_param=False, display=False):
                 d.on_running(q_array[0], q_array[1], q_array[2], step=j, label="step {0:d}/{1:d}".format(j,N))
             else:
                 d.on_running(q_array[:,0], q_array[:,1], q_array[:,2], step=j, label="step {0:d}/{1:d}".format(j,N))
-            time.sleep(1e-5)
+
     if display:
         system("convert -delay 5 -loop 0 tmp/?????.png tmp/temp.gif && rm tmp/?????.png")
         system("convert tmp/temp.gif -fuzz 30% -layers Optimize plots/dynsyst.gif && rm tmp/temp.gif")
diff --git a/lib/objects.py b/lib/objects.py
index 73fca7d..50df1f2 100755
--- a/lib/objects.py
+++ b/lib/objects.py
@@ -163,7 +163,7 @@ class System:
         for body in self.bodylist:
             body.p = body.v*body.m
     
-    def hermite(self, duration, dt, display=False):
+    def hermite(self, duration, dt, recover_param=False, display=False):
         if display:
             try:
                 system("mkdir tmp")
@@ -173,9 +173,14 @@ class System:
             d.on_launch()
 
         N = np.ceil(duration/dt).astype(int)
+        E = np.zeros(N)
+        L = np.zeros((N,3))
         for j in range(N):
             self.HPC(dt)
 
+            E[j] = self.Eval()
+            L[j] = self.Lval()
+
             if display:
                 # display progression
                 q_array = self.get_positions()
@@ -183,7 +188,7 @@ class System:
                     d.on_running(q_array[0], q_array[1], q_array[2], step=j, label="step {0:d}/{1:d}".format(j,N))
                 else:
                     d.on_running(q_array[:,0], q_array[:,1], q_array[:,2], step=j, label="step {0:d}/{1:d}".format(j,N))
-                #time.sleep(1e-5)
-
-        return 1
+        
+        if recover_param:
+            return E, L
 
diff --git a/main.py b/main.py
index ccbec49..2ea9c9e 100755
--- a/main.py
+++ b/main.py
@@ -35,7 +35,7 @@ def main():
 
     duration, step = 100*3e7, 1e4
     E, L = frogleap(duration, step, dyn_syst, recover_param=True)#, display=True)
-    #dyn_syst.hermite(duration,step, display=True)
+    E, L = dyn_syst.hermite(duration,step, recover_param=True, display=True)
     
     fig1 = plt.figure(figsize=(30,15))
     ax1 = fig1.add_subplot(111)