diff --git a/scripts/plot_noise_and_signal.py b/scripts/plot_noise_and_signal.py
new file mode 100644
index 0000000..a8852e4
--- /dev/null
+++ b/scripts/plot_noise_and_signal.py
@@ -0,0 +1,58 @@
+# -*- coding: utf-8 -*-
+# @Author: Elena Graverini
+# @Date:   2017-04-28 15:34:06
+# @Last Modified by:   Elena Graverini
+# @Last Modified time: 2017-04-28 15:56:59
+from __future__ import print_function
+import sys
+import os
+import ROOT as r
+
+
+def draw_cali_step(i, sig, noi, layer, sector, ns):
+    cuts_noi = "(odinStep==%s && sector==%s)" % (i, sector)
+    cuts_sig = "(TrChi2/TrNDoF<3.0) &&"\
+               "(GhostP<0.01+0.1/1.6*TrChi2/TrNDoF) &&"\
+               "(GhostP<0.01-0.1/3.4*(TrChi2/TrNDoF-5.0))"
+    if 'IT' in layer:
+        cuts_sig = "(GhostP<0.1*TrChi2/TrNDoF) &&"\
+                   "(GhostP<0.2-0.1*(TrChi2/TrNDoF-5.0))"
+    cuts_sig = cuts_noi + '&&' + cuts_sig
+    c = r.TCanvas()
+    h_sig = r.TH1F("h_sig", "Signal histo", 208, -32.0, 176.0)
+    h_sig.SetLineWidth(3)
+    h_sig.SetLineColor(r.kBlue)
+    h_bkg = r.TH1F("h_bkg", "Background histo", 208, -32.0, 176.0)
+    h_bkg.SetLineWidth(3)
+    h_bkg.SetLineColor(r.kRed)
+    noi.Draw("val%s>>h_bkg" % ns, cuts_noi)
+    sig.Draw("val%s>>h_sig" % ns, cuts_sig, "same")
+    c.Modified()
+    c.Update()
+    os.system("mkdir -p plot_noise_and_signal")
+    c.SaveAs("%s_%s_val%s_step%s.pdf")
+    h_sig.Delete()
+    h_bkg.Delete()
+
+
+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/')
+    r.gROOT.SetBatch(True)
+
+    fill = int(sys.argv[1])
+    sector = int(sys.argv[2])
+
+    filename = location + '/' + detector + '/' + layer + '/%s.root' % fill
+    file = r.TFile(filename, 'read')
+    sig = file.Get('STADCTrackMonitor/HitInfo/%s' % layer)
+    noi = file.Get('STADCTrackMonitor/NoiseInfo/%s' % layer)
+
+    for i in range(66):
+        draw_cali_step(i, sig, noi, layer, sector, ns)
+
+    file.Close()