diff --git a/libm65/zplot.f90 b/libm65/zplot.f90
new file mode 100644
index 000000000..55aa3c6fa
--- /dev/null
+++ b/libm65/zplot.f90
@@ -0,0 +1,34 @@
+subroutine zplot(amp,nz,jj,ave,rms)
+
+  real amp(nz)
+  character*1 line(100),mark(0:6)
+  data mark/' ',' ','.','-','+','X','$'/
+
+  sum=0.
+  smax=0.
+  do i=1,nz
+     sum=sum+amp(i)
+     if(amp(i).gt.smax) then
+        smax=amp(i)
+        ipk=i
+     endif
+  enddo
+  ave=(sum-smax)/(nz-1)
+  sq=0.
+  do i=1,nz
+     if(i.ne.ipk) sq=sq+(amp(i)-ave)**2
+  enddo
+  rms=sqrt(sq/(nz-2))
+
+  do i=1,nz
+     n=(amp(i)-ave)/rms
+!     n=(amp(i)-ave)/0.33
+     if(n.lt.0) n=0
+     if(n.gt.6) n=6
+     line(i)=mark(n)
+  enddo
+  write(89,1010) jj,0.01*ave,0.01*rms,(line(i),i=1,nz)
+1010 format(i3,2f6.1,1x,100a1)
+  
+  return
+end subroutine zplot
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 3a3c274f5..c9dff6150 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -1,4 +1,4 @@
-//--------------------------------------------------------------- MainWindow
+//-------------------------------------------------------------- MainWindow
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include "devsetup.h"