diff --git a/scripts/obsutils.py b/scripts/obsutils.py
index 79a4b5b..b163ad2 100755
--- a/scripts/obsutils.py
+++ b/scripts/obsutils.py
@@ -52,24 +52,16 @@ def sim(obs, log=False, debug=False, edisp=False, seed=0, nbins=0,
     # Optionally switch-on debugging model
     if debug:
         sim["debug"].boolean(True)
-
-    # Optionally apply energy dispersion
-    sim["edisp"].boolean(edisp)
     
     # Run ctobssim application. This will loop over all observations in the
     # container and simulation the events for each observation. Note that
     # events are not added together, they still apply to each observation
     # separately.
     sim.run()
-
-    # Make a deep copy of the observation that will be returned
-    # (the ctobssim object will go out of scope one the function is
-    # left)
-    obssim = sim.obs().copy()
-    obsbin = None
     
     # Binned option?
     if nbins > 0:
+    
         # Determine common energy boundaries for observations
         emin = None
         emax = None
@@ -84,7 +76,7 @@ def sim(obs, log=False, debug=False, edisp=False, seed=0, nbins=0,
                 emax = run_emax
             elif run_emax > emax:
                 emax = run_emax
-
+    
         # Allocate ctbin application and set parameters
         bin = ctools.ctbin(sim.obs())
         bin["ebinalg"].string("LOG")
@@ -113,13 +105,13 @@ def sim(obs, log=False, debug=False, edisp=False, seed=0, nbins=0,
         # Make a deep copy of the observation that will be returned
         # (the ctbin object will go out of scope one the function is
         # left)
-        obsbin = bin.obs().copy()
+        obs = bin.obs().copy()
         
     # Delete the simulation
     del sim
     
     # Return observation container
-    return obsbin,obssim
+    return obs
 
 
 # ================ #