diff --git a/schainpy/Model/Spectra.py b/schainpy/Model/Spectra.py
index 4d1c05b..aeef1f7 100644
--- a/schainpy/Model/Spectra.py
+++ b/schainpy/Model/Spectra.py
@@ -43,6 +43,8 @@ class Spectra(JROData):
           
         self.heightList  = None
         
+        self.channelList = None
+        
         self.flagNoData = True
         
         self.nProfiles = None