diff --git a/models/Makefile.am b/models/Makefile.am
index 239f736..d00a11e 100644
--- a/models/Makefile.am
+++ b/models/Makefile.am
@@ -1,9 +1,9 @@
 ## Process this file with automake to produce Makefile.in
 
 # Background rate files to distribute
-bkgs = bkg_dummy.txt
-bkgsdir   = $(datadir)/models
-bkgs_DATA = $(bkgs)
+#bkgs = bkg_dummy.txt
+#bkgsdir   = $(datadir)/models
+#bkgs_DATA = $(bkgs)
 
 # Models to distribute
 models      = crab.xml \
@@ -16,4 +16,4 @@ modelsdir   = $(datadir)/models
 models_DATA = $(models)
 
 # Extra files to be distributed in the tar file
-EXTRA_DIST = $(bkgs) $(models)
+EXTRA_DIST = $(models)
diff --git a/models/bkg_dummy.txt b/models/bkg_dummy.txt
deleted file mode 100644
index 3a65044..0000000
--- a/models/bkg_dummy.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-19952.6231497 0.00888770093889
-31622.7766017 0.0528862764556
-50118.7233627 0.0584088588708
-79432.8234724 0.0245627698931
-125892.541179 0.00930817022553
-199526.231497 0.00117990856387
-316227.766017 0.000458229904465
-501187.233627 0.000135628482432
-794328.234724 8.99472876298e-05
-1258925.41179 1.46319988679e-05
-1995262.31497 2.23452132224e-05
-3162277.66017 4.28526605833e-06
-5011872.33627 3.02154407423e-06
-7943282.34724 8.46588074886e-07
-12589254.1179 1.05217831413e-06
-19952623.1497 4.95410035794e-07
-31622776.6017 3.77171043065e-07
-50118723.3627 4.05250267135e-07
-79432823.4724 1.31996926243e-07
-125892541.179 3.23120422483e-08
diff --git a/models/crab.xml b/models/crab.xml
index 6efac43..1130f67 100644
--- a/models/crab.xml
+++ b/models/crab.xml
@@ -11,12 +11,11 @@
       <parameter name="DEC" scale="1.0" value="22.0145" min="-90"  max="90"  free="0"/>
     </spatialModel>
   </source>
-  <source name="Background" type="RadialAcceptance" instrument="CTA">
-    <spectrum type="FileFunction" file="$CTOOLS/share/models/bkg_dummy.txt">
-      <parameter scale="1.0" name="Normalization" min="0.0" max="1000.0" value="1.0" free="1"/>
+  <source name="CTABackgroundModel" type="CTAIrfBackground" instrument="CTA">
+    <spectrum type="PowerLaw">	
+      <parameter name="Prefactor" scale="1.0"  value="1.0"  min="1e-3" max="1e+3"   free="1"/>	
+      <parameter name="Index"     scale="1.0"  value="0.0"  min="-5.0" max="+5.0"   free="1"/>	
+      <parameter name="Scale"     scale="1e6"  value="1.0"  min="0.01" max="1000.0" free="0"/>	
     </spectrum>
-    <radialModel type="Gaussian">
-       <parameter name="Sigma" scale="1.0" value="3.0" min="0.01" max="10.0" free="1"/>
-    </radialModel>
-  </source>
+  </source>	
 </source_library>
diff --git a/models/disk.xml b/models/disk.xml
index 2376938..cc74775 100644
--- a/models/disk.xml
+++ b/models/disk.xml
@@ -12,12 +12,11 @@
       <parameter name="Radius" scale="1.0" value="0.45"    min="0.01" max="10"  free="1"/>
     </spatialModel>
   </source>
-  <source name="Background" type="RadialAcceptance" instrument="CTA">
-    <spectrum type="FileFunction" file="$CTOOLS/share/models/bkg_dummy.txt">
-      <parameter scale="1.0" name="Normalization" min="0.0" max="1000.0" value="1.0" free="1"/>
+  <source name="CTABackgroundModel" type="CTAIrfBackground" instrument="CTA">
+    <spectrum type="PowerLaw">	
+      <parameter name="Prefactor" scale="1.0"  value="1.0"  min="1e-3" max="1e+3"   free="1"/>	
+      <parameter name="Index"     scale="1.0"  value="0.0"  min="-5.0" max="+5.0"   free="1"/>	
+      <parameter name="Scale"     scale="1e6"  value="1.0"  min="0.01" max="1000.0" free="0"/>	
     </spectrum>
-    <radialModel type="Gaussian">
-       <parameter name="Sigma" scale="1.0" value="3.0" min="0.01" max="10.0" free="1"/>
-    </radialModel>
-  </source>
+  </source>	
 </source_library>
diff --git a/models/gauss.xml b/models/gauss.xml
index 6157fbd..d5058d0 100644
--- a/models/gauss.xml
+++ b/models/gauss.xml
@@ -12,12 +12,11 @@
       <parameter name="Sigma" scale="1.0" value="0.20"    min="0.01" max="10"  free="1"/>
     </spatialModel>
   </source>
-  <source name="Background" type="RadialAcceptance" instrument="CTA">
-    <spectrum type="FileFunction" file="$CTOOLS/share/models/bkg_dummy.txt">
-      <parameter scale="1.0" name="Normalization" min="0.0" max="1000.0" value="1.0" free="1"/>
+  <source name="CTABackgroundModel" type="CTAIrfBackground" instrument="CTA">
+    <spectrum type="PowerLaw">	
+      <parameter name="Prefactor" scale="1.0"  value="1.0"  min="1e-3" max="1e+3"   free="1"/>	
+      <parameter name="Index"     scale="1.0"  value="0.0"  min="-5.0" max="+5.0"   free="1"/>	
+      <parameter name="Scale"     scale="1e6"  value="1.0"  min="0.01" max="1000.0" free="0"/>	
     </spectrum>
-    <radialModel type="Gaussian">
-       <parameter name="Sigma" scale="1.0" value="3.0" min="0.01" max="10.0" free="1"/>
-    </radialModel>
-  </source>
+  </source>	
 </source_library>
diff --git a/models/shell.xml b/models/shell.xml
index f02ccaa..775c51b 100644
--- a/models/shell.xml
+++ b/models/shell.xml
@@ -13,12 +13,11 @@
       <parameter name="Width"  scale="1.0" value="0.10"    min="0.01" max="10"  free="1"/>
     </spatialModel>
   </source>
-  <source name="Background" type="RadialAcceptance" instrument="CTA">
-    <spectrum type="FileFunction" file="$CTOOLS/share/models/bkg_dummy.txt">
-      <parameter scale="1.0" name="Normalization" min="0.0" max="1000.0" value="1.0" free="1"/>
+  <source name="CTABackgroundModel" type="CTAIrfBackground" instrument="CTA">
+    <spectrum type="PowerLaw">	
+      <parameter name="Prefactor" scale="1.0"  value="1.0"  min="1e-3" max="1e+3"   free="1"/>	
+      <parameter name="Index"     scale="1.0"  value="0.0"  min="-5.0" max="+5.0"   free="1"/>	
+      <parameter name="Scale"     scale="1e6"  value="1.0"  min="0.01" max="1000.0" free="0"/>	
     </spectrum>
-    <radialModel type="Gaussian">
-       <parameter name="Sigma" scale="1.0" value="3.0" min="0.01" max="10.0" free="1"/>
-    </radialModel>
-  </source>
+  </source>	
 </source_library>