diff --git a/mainwindow.cpp b/mainwindow.cpp
index 49b757bd2..b66447301 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -118,6 +118,7 @@ int   fast_jh;
 int   fast_jh2;
 int narg[15];
 QVector<QColor> g_ColorTbl;
+bool g_single_decode;
 
 namespace
 {
@@ -672,6 +673,7 @@ MainWindow::MainWindow(bool multiple, QSettings * settings, QSharedMemory *shdme
     if(m_config.decode_at_52s()) m_hsymStop=179;
   }
   VHF_features_enabled(m_config.enable_VHF_features());
+  g_single_decode=m_config.single_decode();
 
   progressBar->setMaximum(m_TRperiod);
   m_modulator->setPeriod(m_TRperiod); // TODO - not thread safe
@@ -1847,7 +1849,6 @@ void MainWindow::decode()                                       //decode()
   if(m_config.EMEonly()) dec_data.params.nexp_decode += 16;
   if(m_config.single_decode()) dec_data.params.nexp_decode += 32;
 
-
   strncpy(dec_data.params.datetime, m_dateTime.toLatin1(), 20);
   strncpy(dec_data.params.mycall, (m_config.my_callsign()+"            ").toLatin1(),12);
   strncpy(dec_data.params.mygrid, (m_config.my_grid()+"      ").toLatin1(),6);
@@ -2566,6 +2567,7 @@ void MainWindow::guiUpdate()
 
 //Once per second:
   if(nsec != m_sec0) {
+    g_single_decode=m_config.single_decode();
     if(m_auto and m_mode=="Echo" and m_bEchoTxOK) {
       progressBar->setMaximum(6);
       progressBar->setValue(int(m_s6));
diff --git a/plotter.cpp b/plotter.cpp
index 264c9b748..d567fc119 100644
--- a/plotter.cpp
+++ b/plotter.cpp
@@ -2,7 +2,6 @@
 #include <math.h>
 #include <QDebug>
 #include "commons.h"
-
 #include "moc_plotter.cpp"
 
 #define MAX_SCREENSIZE 2048
@@ -222,7 +221,7 @@ void CPlotter::DrawOverlay()                                 //DrawOverlay()
   if(m_OverlayPixmap.isNull()) return;
   if(m_WaterfallPixmap.isNull()) return;
   int w = m_WaterfallPixmap.width();
-  int x,y,x1,x2;
+  int x,y,x1,x2,x3,x4,x5;
   float pixperdiv;
 
   double df = m_binsPerPixel*m_fftBinWidth;
@@ -342,7 +341,6 @@ void CPlotter::DrawOverlay()                                 //DrawOverlay()
     if(m_nSubMode==2) bw=4*bw;
   }
 
-
   QPen pen0(Qt::green, 3);                 //Mark Rx Freq with green
   painter0.setPen(pen0);
   if(m_mode=="WSPR-2") {                   //### WSPR-15 code needed here, too ###
@@ -356,6 +354,14 @@ void CPlotter::DrawOverlay()                                 //DrawOverlay()
     painter0.drawLine(x1,24,x1,30);
     painter0.drawLine(x1,28,x2,28);
     painter0.drawLine(x2,24,x2,30);
+    if(g_single_decode) {
+      x3=XfromFreq(m_rxFreq+22.0*bw/66.0);
+      painter0.drawLine(x3,24,x3,30);
+      x4=XfromFreq(m_rxFreq+32.0*bw/66.0);
+      painter0.drawLine(x4,24,x4,30);
+      x5=XfromFreq(m_rxFreq+42.0*bw/66.0);
+      painter0.drawLine(x5,24,x5,30);
+    }
   }
 
   if(m_mode=="JT9" or m_mode=="JT65" or m_mode=="JT9+JT65" or
diff --git a/plotter.h b/plotter.h
index c8a2c0e49..4d00bcf14 100644
--- a/plotter.h
+++ b/plotter.h
@@ -21,6 +21,8 @@
 #define VERT_DIVS 7	//specify grid screen divisions
 #define HORZ_DIVS 20
 
+extern bool g_single_decode;
+
 class CPlotter : public QFrame
 {
   Q_OBJECT;