diff --git a/echograph.cpp b/echograph.cpp
index fce457d07..1a33ecc5a 100644
--- a/echograph.cpp
+++ b/echograph.cpp
@@ -27,8 +27,12 @@ EchoGraph::EchoGraph(QSettings * settings, QWidget *parent) :
   ui->echoPlot->setPlotGain(m_settings->value("PlotGain", 0).toInt());
   ui->zeroSlider->setValue(ui->echoPlot->getPlotZero());
   ui->gainSlider->setValue(ui->echoPlot->getPlotGain());
-  ui->smoothSpinBox->setValue(m_settings->value("Smooth",0).toInt());
-  ui->binsPerPixelSpinBox->setValue(m_settings->value("EchoBPP",0).toInt());
+  int n=m_settings->value("Smooth",0).toInt();
+  ui->echoPlot->m_smooth=n;
+  ui->smoothSpinBox->setValue(n);
+  n=m_settings->value("EchoBPP",0).toInt();
+  ui->echoPlot->m_binsPerPixel=n;
+  ui->binsPerPixelSpinBox->setValue(n);
   ui->echoPlot->m_blue=m_settings->value("BlueCurve",false).toBool();
   ui->cbBlue->setChecked(ui->echoPlot->m_blue);
   m_settings->endGroup();
diff --git a/echograph.ui b/echograph.ui
index 8522cca83..1a820f2b4 100644
--- a/echograph.ui
+++ b/echograph.ui
@@ -154,10 +154,10 @@
        <item>
         <widget class="QSlider" name="zeroSlider">
          <property name="minimum">
-          <number>-100</number>
+          <number>-50</number>
          </property>
          <property name="maximum">
-          <number>100</number>
+          <number>150</number>
          </property>
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
diff --git a/echoplot.cpp b/echoplot.cpp
index 3a9a472be..22540b506 100644
--- a/echoplot.cpp
+++ b/echoplot.cpp
@@ -53,19 +53,14 @@ void EPlotter::resizeEvent(QResizeEvent* )                    //resizeEvent()
     m_h = m_Size.height();
     m_h1=30;
     m_h2=m_h-m_h1;
-
-    qDebug() << m_h << m_h1 << m_h2;
-
     m_2DPixmap = QPixmap(m_Size.width(), m_h2);
     m_2DPixmap.fill(Qt::black);
     m_OverlayPixmap = QPixmap(m_Size.width(), m_h2);
     m_OverlayPixmap.fill(Qt::black);
-
     m_2DPixmap.fill(Qt::black);
     m_ScalePixmap = QPixmap(m_w,30);
     m_ScalePixmap.fill(Qt::white);
-
-    m_fSpan=m_w*m_fftBinWidth;
+    m_fSpan=m_w*m_fftBinWidth*m_binsPerPixel;
     m_StartFreq=50 * int((-0.5*m_fSpan)/50.0 - 0.5);
   }
   DrawOverlay();
@@ -98,7 +93,7 @@ void EPlotter::draw()                           //draw()
     QPen penBlue(QColor(0,255,255),1);
     QPen penRed(Qt::red,1);
     j=0;
-    int i0=1000 + int(m_StartFreq/m_fftBinWidth);
+    int i0=1000 + int(m_StartFreq/(m_fftBinWidth*m_binsPerPixel));
     for(i=0; i<2000; i++) {
       blue[i]=echocom_.blue[i];
       red[i]=echocom_.red[i];
@@ -115,7 +110,7 @@ void EPlotter::draw()                           //draw()
       painter2D.setPen(penBlue);
       j=0;
       for(i=0; i<m_w; i++) {
-        y = 0.9*m_h2 - gain*(m_h/10.0)*(blue[i0+i]-1.0) - m_plotZero;
+        y = 0.9*m_h2 - gain*(m_h/10.0)*(blue[i0+i]-1.0) - 0.01*m_h2*m_plotZero;
         LineBuf[j].setX(i);
         LineBuf[j].setY(y);
         j++;
@@ -126,7 +121,7 @@ void EPlotter::draw()                           //draw()
     painter2D.setPen(penRed);
     j=0;
     for(int i=0; i<m_w; i++) {
-      y = 0.9*m_h2 - gain*(m_h/10.0)*(red[i0+i]-1.0) - m_plotZero;
+      y = 0.9*m_h2 - gain*(m_h/10.0)*(red[i0+i]-1.0) - 0.01*m_h2*m_plotZero;
       LineBuf[j].setX(i);
       LineBuf[j].setY(y);
       j++;
@@ -153,13 +148,22 @@ void EPlotter::DrawOverlay()                                 //DrawOverlay()
   painter.drawRect(0, 0, m_w, m_h2);
   painter.setBrush(Qt::SolidPattern);
 
-  m_fSpan = m_w*m_fftBinWidth;
+  m_fSpan = m_w*m_fftBinWidth*m_binsPerPixel;
   m_freqPerDiv=20;
   if(m_fSpan>250) m_freqPerDiv=50;
-  float pixPerHdiv = m_freqPerDiv/m_fftBinWidth;
+  if(m_fSpan>500) m_freqPerDiv=100;
+  if(m_fSpan>1000) m_freqPerDiv=200;
+  if(m_fSpan>2000) m_freqPerDiv=500;
+
+//  m_StartFreq=50 * int((-0.5*m_fSpan)/50.0 - 0.5);
+  m_StartFreq=m_freqPerDiv * int((-0.5*m_fSpan)/m_freqPerDiv - 0.5);
+
+  qDebug() << m_fSpan << m_freqPerDiv << m_StartFreq;
+
+  float pixPerHdiv = m_freqPerDiv/(m_fftBinWidth*m_binsPerPixel);
   float pixPerVdiv = float(m_h2)/float(VERT_DIVS);
 
-  m_hdivs = m_w*m_fftBinWidth/m_freqPerDiv + 0.9999;
+  m_hdivs = m_w*m_fftBinWidth*m_binsPerPixel/m_freqPerDiv + 0.9999;
 
   painter.setPen(QPen(Qt::white, 1,Qt::DotLine));
   for( int i=1; i<m_hdivs; i++)                   //draw vertical grids
@@ -252,7 +256,7 @@ int EPlotter::XfromFreq(float f)                               //XfromFreq()
 
 float EPlotter::FreqfromX(int x)                               //FreqfromX()
 {
-  return float(m_StartFreq + x*m_fftBinWidth);
+  return float(m_StartFreq + x*m_fftBinWidth*m_binsPerPixel);
 }
 
 void EPlotter::SetRunningState(bool running)              //SetRunningState()
diff --git a/widegraph.cpp b/widegraph.cpp
index 7bb93374e..a92cffd05 100644
--- a/widegraph.cpp
+++ b/widegraph.cpp
@@ -266,7 +266,6 @@ void WideGraph::setMode(QString mode)                              //setMode
   ui->widePlot->setMode(mode);
   ui->widePlot->DrawOverlay();
   ui->widePlot->update();
-  qDebug() << "WideGraph::setMode" << m_mode;
 }
 
 void WideGraph::setSubMode(int n)                                  //setSubMode