diff --git a/tools/plot_diffs.py b/tools/plot_diffs.py
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+# Copyright (C) 2015, Craig Warren
+#
+# This module is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
+# To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/.
+#
+# Please use the attribution at http://dx.doi.org/10.1190/1.3548506
+
+import os, argparse
+import h5py
+import numpy as np
+np.seterr(divide='ignore')
+import matplotlib.pyplot as plt
+
+"""Plots the differences (in dB) between a response and a reference response."""
+
+# Parse command line arguments
+parser = argparse.ArgumentParser(description='Plots the differences (in dB) between a response and a reference response.', usage='cd gprMax; python -m tools.plot_diffs refoutputfile outputfile')
+parser.add_argument('refoutputfile', help='name of output file including path containing reference response')
+parser.add_argument('outputfile', help='name of output file including path')
+args = parser.parse_args()
+
+# Load (from gprMax output file) the reference response
+f = h5py.File(args.refoutputfile, 'r')
+tmp = f['/rxs/rx1/']
+fieldname = list(tmp.keys())[0]
+refresp = np.array(tmp[fieldname])
+
+# Load (from gprMax output file) the response
+f = h5py.File(args.outputfile, 'r')
+tmp = f['/rxs/rx1/']
+fieldname = list(tmp.keys())[0]
+modelresp = np.array(tmp[fieldname])
+
+# Calculate differences
+diffdB = np.abs(modelresp - refresp) / np.amax(np.abs(refresp))
+diffdB = 20 * np.log10(diffdB)
+print(np.abs(np.sum(diffdB[-np.isneginf(diffdB)])) / len(diffdB[-np.isneginf(diffdB)]))
+
+# Plot differences
+fig, ax = plt.subplots(subplot_kw=dict(xlabel='Iterations', ylabel='Error [dB]'), num=args.outputfile, figsize=(20, 10), facecolor='w', edgecolor='w')
+ax.plot(diffdB, 'r', lw=2)
+ax.grid()
+plt.show()
+
+
+
+
+
+
+
+
+
+
+
+
+    
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