diff -r b243f896e5f4 -r 022f6f2bc09c generic.py
--- a/generic.py	Mon Jan 26 17:55:34 2015 +0200
+++ b/generic.py	Wed Apr 01 13:06:08 2015 +0300
@@ -419,8 +419,8 @@
         self.rc = []
         self.duration  = 60
         
-    def calculate_rc(self):
-        background = np.mean(self.matrix[:,4000:], axis = 1)  # Calculate the background from 30000m and above
+    def calculate_rc(self, idx_min = 4000, idx_max = 5000):
+        background = np.mean(self.matrix[:,idx_min:idx_max], axis = 1)  # Calculate the background from 30000m and above
         self.rc = (self.matrix.transpose()- background).transpose() * (self.z **2)