diff --git a/demod/iq_svcl/plot_fft.py b/demod/iq_svcl/plot_fft.py
index e127027..32a81d0 100644
--- a/demod/iq_svcl/plot_fft.py
+++ b/demod/iq_svcl/plot_fft.py
@@ -23,10 +23,18 @@ data = np.genfromtxt( fft_file, delimiter=';', names=['fq','db'] , skip_header=1
 fq   = data['fq']
 db   = data['db']
 
+N = len(db)
+m = np.mean(db)
+
+db5 = np.full(N, m)
+for n in range(2, N-2):
+    db5[n] = (db[n-2]+db[n-1]+db[n]+db[n+1]+db[n+2])/5.0
+
 
 ax1 = plt.subplot(111)
 ax1.set_xlim(fq[0], fq[-1])
-ax1.plot( fq, db, color='b', linewidth=0.2, label='fft')
+ax1.plot( fq, db, color='b', linewidth=0.06, label='fft')
+ax1.plot( fq, db5, color='g', linewidth=0.4, label='fft')
 
 plt.show()