diff --git a/tests/test_compare_experimental.py b/tests/test_compare_experimental.py
index 165c35de..961c8b07 100644
--- a/tests/test_compare_experimental.py
+++ b/tests/test_compare_experimental.py
@@ -19,7 +19,6 @@
 import sys, os, argparse
 import h5py
 import numpy as np
-import matplotlib as mpl
 import matplotlib.pyplot as plt
 
 from gprMax.exceptions import CmdInputError
@@ -38,16 +37,24 @@ f = h5py.File(args.modelfile, 'r')
 path = '/rxs/rx1/'
 availablecomponents = list(f[path].keys())
 
-# Check if requested output is in file
+# Check for polarity of output and if requested output is in file
+if args.output[0][0] == 'm':
+    polarity = -1
+    args.outputs[0] = args.output[0][1:]
+else:
+    polarity = 1
+
 if args.output[0] not in availablecomponents:
     raise CmdInputError('{} output requested to plot, but the available output for receiver 1 is {}'.format(args.output[0], ', '.join(availablecomponents)))
 
 floattype = f[path + args.output[0]].dtype
-model = np.zeros((f.attrs['Iterations']), dtype=floattype)
-timemodel = np.zeros((f.attrs['Iterations']), dtype=floattype)
-timemodel = np.arange(0, f.attrs['dt'] * f.attrs['Iterations'], f.attrs['dt']) / 1e-9
-model = f[path + args.output[0]][:] * -1
+iterations = f.attrs['Iterations']
+dt = f.attrs['dt']
+model = np.zeros(iterations, dtype=floattype)
+model = f[path + args.output[0]][:] * polarity
 model /= np.amax(np.abs(model))
+timemodel = np.linspace(0, 1, iterations)
+timemodel *= (iterations * dt)
 f.close()
 
 # Find location of maximum value from model
@@ -65,14 +72,16 @@ difftime = - (timemodel[modelmax] - real[realmax,0])
 fig, ax = plt.subplots(num=args.modelfile + ' versus ' + args.realfile, figsize=(20, 10), facecolor='w', edgecolor='w')
 ax.plot(timemodel + difftime, model, 'r', lw=2, label='Model')
 ax.plot(real[:,0], real[:,1], 'r', ls='--', lw=2, label='Experiment')
-ax.set_xlabel('Time [ns]')
+ax.set_xlabel('Time [s]')
 ax.set_ylabel('Amplitude')
 ax.set_xlim([0, timemodel[-1]])
 ax.set_ylim([-1, 1])
 ax.legend()
 ax.grid()
 
-# Show/print plots
+# Save a PDF/PNG of the figure
 savename = os.path.abspath(os.path.dirname(args.modelfile)) + os.sep + os.path.splitext(os.path.split(args.modelfile)[1])[0] + '_vs_' + os.path.splitext(os.path.split(args.realfile)[1])[0]
 #fig.savefig(savename + '.pdf', dpi=None, format='pdf', bbox_inches='tight', pad_inches=0.1)
+#fig.savefig((savename + '.png', dpi=150, format='png', bbox_inches='tight', pad_inches=0.1)
+
 plt.show()
\ No newline at end of file