diff --git a/tools/plot_Ascan.py b/tools/plot_Ascan.py
index 5dbf7172..456cd45e 100644
--- a/tools/plot_Ascan.py
+++ b/tools/plot_Ascan.py
@@ -224,7 +224,7 @@ if __name__ == "__main__":
     # Parse command line arguments
     parser = argparse.ArgumentParser(description='Plots electric and magnetic fields and currents from all receiver points in the given output file. Each receiver point is plotted in a new figure window.', usage='cd gprMax; python -m tools.plot_Ascan outputfile')
     parser.add_argument('outputfile', help='name of output file including path')
-    parser.add_argument('--outputs', help='outputs to be plotted', default=Rx.availableoutputs, choices=['Ex', 'Ey', 'Ez', 'Hx', 'Hy', 'Hz', 'Ix', 'Iy', 'Iz', 'Ex-', 'Ey-', 'Ez-', 'Hx-', 'Hy-', 'Hz-', 'Ix-', 'Iy-', 'Iz-'], nargs='+')
+    parser.add_argument('--outputs', help='outputs to be plotted', default=Rx.defaultoutputs, choices=['Ex', 'Ey', 'Ez', 'Hx', 'Hy', 'Hz', 'Ix', 'Iy', 'Iz', 'Ex-', 'Ey-', 'Ez-', 'Hx-', 'Hy-', 'Hz-', 'Ix-', 'Iy-', 'Iz-'], nargs='+')
     parser.add_argument('-fft', action='store_true', help='plot FFT (single output must be specified)', default=False)
     args = parser.parse_args()