diff --git a/lib/plotsave.f90 b/lib/plotsave.f90
index ef5da4c09..8db68f97d 100644
--- a/lib/plotsave.f90
+++ b/lib/plotsave.f90
@@ -1,43 +1,29 @@
-subroutine plotsave(splot,ka,nbpp,irow,jz,swide)
+subroutine plotsave(swide,nw,nh,irow)
 
   parameter (NSMAX=6827,NYMAX=64)
-  real splot(NSMAX)
-  real spsave(NSMAX,NYMAX)
-  real swide(jz)
-  real s(NSMAX),tmp(NSMAX)
-  data ncall/0/
-  save ncall,spsave
+  real, dimension(:,:), allocatable :: sw
+  real swide(0:nw-1)
+  data nw0/-1/,nh0/-1/
+  save nw0,nh0,sw
+
+  if(nw.ne.nw0 .or. nh.ne.nh0) then
+     if(nw0.ne.-1) deallocate(sw)
+     allocate(sw(0:nw-1,0:nh-1))
+     sw=0.
+     nw0=nw
+     nh0=nh
+  endif
 
   df=12000.0/16384
   if(irow.lt.0) then
-! Save a new row of data
-     ncall=ncall+1
-     k=mod(ncall-1,NYMAX) + 1
-     spsave(1:NSMAX,k)=splot
-     rewind 61
-     do i=1,NSMAX
-        write(61,3061) i,splot(i),ncall
-3061    format(i8,f12.3,i8)
+! Push a new row of data into sw
+     do j=nh-1,1,-1
+        sw(0:nw-1,j)=sw(0:nw-1,j-1)
      enddo
+     sw(0:nw-1,0)=swide
   else
-! Process and return the saved "irow" as swide(), for a waterfall replot.
-     k=mod(NYMAX+ncall-1-irow,NYMAX) + 1
-     if(nbpp.eq.1) then
-        swide=spsave(1:jz,k)
-     else
-        s=spsave(1:NSMAX,k)
-        call smo(s,NSMAX,tmp,nbpp)
-        k=ka
-        do j=1,jz
-           smax=0.
-           do i=1,nbpp
-              k=k+1
-              if(k.lt.1 .or. k.gt.NSMAX) exit
-              smax=max(smax,s(k))
-           enddo
-           swide(j)=smax
-        enddo
-     endif
+! Return the saved "irow" as swide(), for a waterfall replot.
+     swide=sw(0:nw-1,irow)
   endif
 
   return
diff --git a/plotter.cpp b/plotter.cpp
index 54a9e9b97..4d763f96a 100644
--- a/plotter.cpp
+++ b/plotter.cpp
@@ -43,6 +43,7 @@ CPlotter::CPlotter(QWidget *parent) :                  //CPlotter Constructor
   setAutoFillBackground(false);
   setAttribute(Qt::WA_OpaquePaintEvent, false);
   setAttribute(Qt::WA_NoSystemBackground, true);
+  m_bReplot=false;
 
   // contextual pop up menu
   setContextMenuPolicy (Qt::CustomContextMenu);
@@ -83,6 +84,7 @@ void CPlotter::resizeEvent(QResizeEvent* )                    //resizeEvent()
     if(m_bReference) m_h2=m_h-30;
     if(m_h2<1) m_h2=1;
     m_h1=m_h-m_h2;
+//    m_line=0;
     m_2DPixmap = QPixmap(m_Size.width(), m_h2);
     m_2DPixmap.fill(Qt::black);
     m_WaterfallPixmap = QPixmap(m_Size.width(), m_h1);
@@ -116,13 +118,12 @@ void CPlotter::draw(float swide[], bool bScroll, bool bRed)
   double fac = sqrt(m_binsPerPixel*m_waterfallAvg/15.0);
   double gain = fac*pow(10.0,0.02*m_plotGain);
   double gain2d = pow(10.0,0.02*(m_plot2dGain));
-  bool bReplot=swide[MAX_SCREENSIZE-1] == -99.0;
 
   if(m_bReference != m_bReference0) resizeEvent(NULL);
   m_bReference0=m_bReference;
 
 //move current data down one line (must do this before attaching a QPainter object)
-  if(bScroll and !bReplot) m_WaterfallPixmap.scroll(0,1,0,0,m_w,m_h1);
+  if(bScroll and !m_bReplot) m_WaterfallPixmap.scroll(0,1,0,0,m_w,m_h1);
   QPainter painter1(&m_WaterfallPixmap);
   m_2DPixmap = m_OverlayPixmap.copy(0,0,m_w,m_h2);
   QPainter painter2D(&m_2DPixmap);
@@ -149,13 +150,17 @@ void CPlotter::draw(float swide[], bool bScroll, bool bRed)
 
   if(bScroll and swide[0]<1.e29) {
     flat4_(swide,&iz,&m_Flatten);
-    if(!bReplot) flat4_(&dec_data.savg[j0],&jz,&m_Flatten);
+    if(!m_bReplot) flat4_(&dec_data.savg[j0],&jz,&m_Flatten);
   }
 
   ymin=1.e30;
   if(swide[0]>1.e29 and swide[0]< 1.5e30) painter1.setPen(Qt::green);
   if(swide[0]>1.4e30) painter1.setPen(Qt::yellow);
-  if(!bReplot) m_j=0;
+  if(!m_bReplot) {
+    m_j=0;
+    int irow=-1;
+    plotsave_(swide,&m_w,&m_h1,&irow);
+  }
   for(int i=0; i<iz; i++) {
     y=swide[i];
     if(y<ymin) ymin=y;
@@ -165,9 +170,10 @@ void CPlotter::draw(float swide[], bool bScroll, bool bRed)
     if (swide[i]<1.e29) painter1.setPen(g_ColorTbl[y1]);
     painter1.drawPoint(i,m_j);
   }
-  if(bReplot) return;
+  if(m_bReplot) return;
 
   m_line++;
+
   float y2min=1.e30;
   float y2max=-1.e30;
   for(int i=0; i<iz; i++) {
@@ -286,11 +292,17 @@ void CPlotter::drawRed(int ia, int ib, float swide[])
   draw(swide,false,true);
 }
 
-void CPlotter::replot(float swide[], bool bScroll, bool bRed, int irow)
+void CPlotter::replot()
 {
-  m_j=irow;
-  draw(swide,bScroll,bRed);
-  update();                                    //trigger a new paintEvent
+  float swide[m_w];
+  for(int irow=0; irow<m_h1; irow++) {
+    m_j=irow;
+    plotsave_(swide,&m_w,&m_h1,&irow);
+    m_bReplot=true;
+    draw(swide,false,false);
+    m_bReplot=false;
+    update();                                    //trigger a new paintEvent
+  }
 }
 
 void CPlotter::DrawOverlay()                   //DrawOverlay()
diff --git a/plotter.h b/plotter.h
index b80359630..722c538de 100644
--- a/plotter.h
+++ b/plotter.h
@@ -37,7 +37,7 @@ public:
   QSize sizeHint() const;
 
   void draw(float swide[], bool bScroll, bool bRed);		//Update the waterfall
-  void replot(float swide[], bool bScroll, bool bRed, int irow);
+  void replot();
   void SetRunningState(bool running);
   void setPlotZero(int plotZero);
   int  plotZero();
@@ -144,6 +144,7 @@ private:
   bool    m_Running;
   bool    m_paintEventBusy;
   bool    m_dataFromDisk;
+  bool    m_bReplot;
 
   double  m_fftBinWidth;
   double  m_dialFreq;
@@ -180,6 +181,7 @@ extern QVector<QColor> g_ColorTbl;
 
 extern "C" {
   void flat4_(float swide[], int* iz, int* nflatten);
+  void plotsave_(float swide[], int* m_w , int* m_h1, int* irow);
 }
 
 #endif // PLOTTER_H
diff --git a/widegraph.cpp b/widegraph.cpp
index adf2c5055..8ab0de518 100644
--- a/widegraph.cpp
+++ b/widegraph.cpp
@@ -198,9 +198,6 @@ void WideGraph::dataSink2(float s[], float df3, int ihsym, int ndiskdata)  //dat
     }
     m_ntr0=ntr;
     ui->widePlot->draw(swide,true,false);
-    int irow=-1;
-    int ka=0;
-    plotsave_(splot,&ka,&nbpp,&irow,&jz,swide);
   }
 }
 
@@ -465,15 +462,7 @@ void WideGraph::on_gainSlider_valueChanged(int value)                 //Gain
 
 void WideGraph::replot()
 {
-  if(!ui->widePlot->scaleOK()) return;
-  int nbpp = ui->widePlot->binsPerPixel();
-  float splot=0.0;
-  int ka=int(ui->widePlot->startFreq()/0.732422 + 0.5) - 1;
-  for(int irow=0; irow<64; irow++) {
-    plotsave_(&splot,&ka,&nbpp,&irow,&m_jz,swide);
-    swide[MAX_SCREENSIZE-1]=-99.0;
-    ui->widePlot->replot(swide,true,false,irow);
-  }
+  if(ui->widePlot->scaleOK()) ui->widePlot->replot();
 }
 
 void WideGraph::on_zeroSlider_valueChanged(int value)                 //Zero
diff --git a/widegraph.h b/widegraph.h
index 4533df1fc..f5e57f8dc 100644
--- a/widegraph.h
+++ b/widegraph.h
@@ -116,9 +116,4 @@ private:
   QString m_waterfallPalette;  
 };
 
-extern "C" {
-  void plotsave_(float splot[], int* ka, int* nbpp, int* irow, int* jz, float swide[]);
-}
-
-
 #endif // WIDEGRAPH_H