diff --git a/scripts/plot_noise_and_signal.py b/scripts/plot_noise_and_signal.py
index fc2fb17..389c18d 100644
--- a/scripts/plot_noise_and_signal.py
+++ b/scripts/plot_noise_and_signal.py
@@ -2,7 +2,7 @@
 # @Author: Elena Graverini
 # @Date:   2017-04-28 15:34:06
 # @Last Modified by:   Elena Graverini
-# @Last Modified time: 2017-04-28 16:05:40
+# @Last Modified time: 2017-04-28 16:11:46
 from __future__ import print_function
 import sys
 import os
@@ -38,7 +38,6 @@
 if __name__ == '__main__':
 
     detector, layer = "TT", "TTaU"
-    ns = 5
 
     location = os.path.expandvars('$DISK/data/ST/Aging_Tuples/')
     macros = os.path.expandvars('$CCEHOME/macros/CCEScan/')
@@ -46,6 +45,7 @@
 
     fill = int(sys.argv[1])
     sector = int(sys.argv[2])
+    ns = int(sys.argv[3])
 
     filename = location + '/' + detector + '/' + layer + '/%s.root' % fill
     file = r.TFile(filename, 'read')