diff --git a/FPC1000_viewer.py b/FPC1000_viewer.py
index 85026f6..b1f4f06 100755
--- a/FPC1000_viewer.py
+++ b/FPC1000_viewer.py
@@ -14,110 +14,110 @@ PORT = 5555
 #==============================================================================
 
 def parse():
-    """
-    Specific parsing procedure for Allan Deviation plotting tool.
-    :returns: populated namespace (parser)
-    """
-    parser = argparse.ArgumentParser(description = 'R&S FPC1000 spectrum viewer',
-                                     epilog = 'Example: \'./FPC1000_viewer.py -ip \'192.168.0.2\' -p 1234\' plot current spectrum from given device')
-
-    parser.add_argument('-ip',
-                        action='store',
-                        dest='ip',
-                        default=IP,
-                        help='device IP (default '+IP+')')
-
-    parser.add_argument('-p',
-                        action='store',
-                        dest='port',
-                        default=PORT,
-                        help='device port (default '+str(PORT)+')')
-
-    args = parser.parse_args()
-    return args
+	"""
+	Specific parsing procedure for Allan Deviation plotting tool.
+	:returns: populated namespace (parser)
+	"""
+	parser = argparse.ArgumentParser(description = 'R&S FPC1000 spectrum viewer',
+									 epilog = 'Example: \'./FPC1000_viewer.py -ip \'192.168.0.2\' -p 1234\' plot current spectrum from given device')
+
+	parser.add_argument('-ip',
+						action='store',
+						dest='ip',
+						default=IP,
+						help='device IP (default '+IP+')')
+
+	parser.add_argument('-p',
+						action='store',
+						dest='port',
+						default=PORT,
+						help='device port (default '+str(PORT)+')')
+
+	args = parser.parse_args()
+	return args
 
 #==============================================================================
 
 def send(sock, command):
-    sock.send("%s\n"%command)
+	sock.send("%s\n"%command)
 
 #==============================================================================
 
 def read(sock):
-    ans = ''
-    nb_data_list = []
-    nb_data = ''
-    try:
-        while ans != '\n':
-            ans = sock.recv(1)
-            nb_data_list.append(ans) # Return the number of data
-        list_size = len(nb_data_list)
-        for j in range (0, list_size):
-            nb_data = nb_data+nb_data_list[j]
-        return nb_data
-    except socket.timeout:
-        print "Socket timeout error when reading."
+	ans = ''
+	nb_data_list = []
+	nb_data = ''
+	try:
+		while ans != '\n':
+			ans = sock.recv(1)
+			nb_data_list.append(ans) # Return the number of data
+		list_size = len(nb_data_list)
+		for j in range (0, list_size):
+			nb_data = nb_data+nb_data_list[j]
+		return nb_data
+	except socket.timeout:
+		print "Socket timeout error when reading."
 
 #==============================================================================
 
 def get_spectrum(sock):
-    send(sock, 'FREQ:STAR?')
-    x1 = read(sock)
-    x1 = float(x1.replace('\n',''))
-    send(sock, 'FREQ:STOP?')
-    x2 = read(sock)
-    x2 = float(x2.replace('\n',''))
-    send(sock, 'TRAC?')
-    y = read(sock)
-    y = numpy.array(y.replace('\n','').split(','), dtype='float')
-    x = numpy.linspace(x1, x2, len(y))
-    return (x, y)
+	send(sock, 'FREQ:STAR?')
+	x1 = read(sock)
+	x1 = float(x1.replace('\n',''))
+	send(sock, 'FREQ:STOP?')
+	x2 = read(sock)
+	x2 = float(x2.replace('\n',''))
+	send(sock, 'TRAC?')
+	y = read(sock)
+	y = numpy.array(y.replace('\n','').split(','), dtype='float')
+	x = numpy.linspace(x1, x2, len(y))
+	return (x, y)
 
 #==============================================================================
 
 def main():
-    """
-    Main script
-    """
-    # Parse command line
-    args = parse()
-    # ip
-    ip = str(args.ip)
-    # port
-    port = int(args.port)
-
-    try:
-        sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM,socket.IPPROTO_TCP)
-        sock.settimeout(10.0)
-        sock.connect((ip, port))
-
-        app = QtGui.QApplication([])
-
-        win = pyqtgraph.GraphicsWindow(title='Basic FPC1000 viewer (%s:%i)'%(ip, port))
-
-        pyqtgraph.setConfigOptions(antialias=True)
-
-        global curve, ptr, p1
-        p1 = win.addPlot(title="Spectrum")
-        curve = p1.plot(pen='y')
-        ptr = 0
-        def update():
-            global curve, ptr, p1
-            (x_data, y_data) = get_spectrum(sock)
-            curve.setData(x = x_data, y = y_data)
-            if ptr == 0:
-                p1.enableAutoRange('xy', False)  ## stop auto-scaling after the first data set is plotted
-            ptr += 1
-        timer = QtCore.QTimer()
-        timer.timeout.connect(update)
-        timer.start(500)
-
-        if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-            QtGui.QApplication.instance().exec_()
-
-    except:
-        pass
-
-        ## Start Qt event loop unless running in interactive mode or using pyside.
+	"""
+	Main script
+	"""
+	# Parse command line
+	args = parse()
+	# ip
+	ip = str(args.ip)
+	# port
+	port = int(args.port)
+
+	try:
+		sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM,socket.IPPROTO_TCP)
+		sock.settimeout(10.0)
+		sock.connect((ip, port))
+
+		app = QtGui.QApplication([])
+
+		win = pyqtgraph.GraphicsWindow(title='Basic FPC1000 viewer (%s:%i)'%(ip, port))
+
+		pyqtgraph.setConfigOptions(antialias=True)
+
+		global curve, ptr, p1
+		p1 = win.addPlot(title="Spectrum")
+		curve = p1.plot(pen='y')
+		ptr = 0
+		def update():
+			global curve, ptr, p1
+			(x_data, y_data) = get_spectrum(sock)
+			curve.setData(x = x_data, y = y_data)
+			if ptr == 0:
+				p1.enableAutoRange('xy', False)  ## stop auto-scaling after the first data set is plotted
+			ptr += 1
+		timer = QtCore.QTimer()
+		timer.timeout.connect(update)
+		timer.start(500)
+
+		if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
+			QtGui.QApplication.instance().exec_()
+
+	except:
+		pass
+
+		## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    main()
+	main()