diff --git a/.travis.yml b/.travis.yml
index ebe47839..f872394d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,32 +2,55 @@ language: python
 python:
   - "3.7"
 
-services:
-  - xvfb
+#services:
+#  - xvfb
 
+env:
+  -DISPLAY=:99.0
+
+before_install:
+  - sh -e /etc/init.d/xvfb start
+    
 #before_script:
 #  - "export DISPLAY=:99.0"
 #  - "sh -e /etc/init.d/xvfb start"
 #  - sleep 3 # give xvfb some time to start
 
+sudo: true
+
+#cache: pip
+
+#on_success: never
+#on_failure: change
+
 git:
   submodules: false
 
 addons:
   apt:
     packages:
- #   - libwebkitgtk-dev
- #   - libjpeg-dev
- #   - libtiff-dev
-    - libgtk-3-dev
- #   - libsdl1.2-dev
- #   - libgstreamer-plugins-base0.10-dev
- #   - freeglut3
- #   - freeglut3-dev
- #   - libnotify-dev
+      - dpkg-dev 
+      - build-essential 
+      - python-dev 
+      - libjpeg-dev 
+      - libtiff5-dev 
+      - libsdl1.2-dev 
+      - libgstreamer-plugins-base0.10-dev 
+      - libnotify-dev 
+      - freeglut3 
+      - freeglut3-dev 
+      - libsm-dev 
+      - libgtk-3-dev 
+      - libpng16-16
+      - libwebkitgtk-3.0-dev 
+      - libgstreamer-plugins-base1.0-dev
+      - at-spi2-core
 
  # command to install dependencies
 install:
-  - pip install -r requirements.txt
+  - travis_wait 50 pip install -U -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-14.04 wxPython
+  - travis_wait 50 python setup.py install
+  - pip install PyPubSub==3.3.0 pyyaml ruamel.yaml
+
 # command to run
-script: python devsimpy.py
\ No newline at end of file
+script: travis_wait 20 python devsimpy.py examples/model0.dsp stop
\ No newline at end of file
diff --git a/PlotGUI.py b/PlotGUI.py
index cd1fce0b..192e4229 100644
--- a/PlotGUI.py
+++ b/PlotGUI.py
@@ -445,7 +445,7 @@ def OnPlotLine(self, event=None):
 					m = max([a[1] for a in dd])
 					dd = [(b[0], b[1]/m) for b in dd]
 
-				L.append(plot.PolyLine(d, legend = 'Port %d %s'%(ind,self.legend), colour = cc, width=1))
+				L.append(plot.PolyLine(dd, legend = 'Port %d %s'%(ind,self.legend), colour = cc, width=1))
 
 				a,b,c,d = get_limit(dd)
 
diff --git a/devsimpy.py b/devsimpy.py
index bb56d1f3..be144505 100644
--- a/devsimpy.py
+++ b/devsimpy.py
@@ -1674,6 +1674,16 @@ def StartSimulationGUIWin(self, arg, diagrams):
 							evt = wx.PyCommandEvent(wx.EVT_BUTTON.typeId, sf._btn1.GetId())
 							wx.PostEvent(sf._btn1, evt)
 	
+		finally:
+			### Force to close DEVSimPy
+			try:
+				arg = sys.argv[-1]
+			except IndexError:
+				pass
+			else:
+				if arg in ('close','quit'):
+					self.Close()
+
 	##----------------------------------------------
 	#def AdjustTab(self, evt):
 		## clic sur simulation
@@ -2384,6 +2394,7 @@ def SetExceptionHook(self):
 		sys.stdout.write(_('\t To load an existing dsp with a simulation frame initialized with no time limit: \n\t\t$ python devsimpy.py <absolute path of the .dsp file> ntl/inf/infinity\n'))
 		sys.stdout.write(_('\t To start simulation: \n\t\t$ python devsimpy.py <absolute path of the .dsp file> ntl/inf/infinity start/go\n'))
 		sys.stdout.write(_('\t To execute DEVSimPy cleaner: python devsimpy.py -c|-clean\n'))
+		sys.stdout.write(_('\t To close DEVSimPy: python devsimpy.py close|quit\n'))
 		sys.stdout.write(_('Authors: L. Capocchi (capocchi@univ-corse.fr)\n'))
 		sys.exit()