diff --git a/schainpy/model/data/jrodata.py b/schainpy/model/data/jrodata.py
index 9c57336..a06fe8e 100644
--- a/schainpy/model/data/jrodata.py
+++ b/schainpy/model/data/jrodata.py
@@ -577,6 +577,17 @@ class SpectraHeis(Spectra):
         self.utctime = None
         
         self.blocksize = None
+    
+    def getNormFactor(self):
+        pwcode = 1
+        if self.flagDecodeData:
+            pwcode = numpy.sum(self.code[0]**2)
+        
+        normFactor = self.nIncohInt*self.nCohInt*pwcode
+        
+        return normFactor
+    
+    normFactor = property(getNormFactor, "I'm the 'getNormFactor' property.")
 
 class Fits:
     
diff --git a/schainpy/model/graphics/jroplot_heispectra.py b/schainpy/model/graphics/jroplot_heispectra.py
index ed7abd0..8ad3844 100644
--- a/schainpy/model/graphics/jroplot_heispectra.py
+++ b/schainpy/model/graphics/jroplot_heispectra.py
@@ -114,7 +114,9 @@ class SpectraHeisScope(Figure):
         #x= x/(10000.0)
 #        y = dataOut.data[channelIndexList,:] * numpy.conjugate(dataOut.data[channelIndexList,:])
 #        y = y.real
-        datadB = 10.*numpy.log10(dataOut.data_spc)
+        factor = dataOut.normFactor
+        data = dataOut.data_spc / factor
+        datadB = 10.*numpy.log10(data)
         y = datadB
         
         #thisDatetime = dataOut.datatime