diff --git a/widegraph.cpp b/widegraph.cpp
index a64511f83..43a5c536d 100644
--- a/widegraph.cpp
+++ b/widegraph.cpp
@@ -252,6 +252,11 @@ int WideGraph::Fmax()                                              //Fmax
   return n;
 }
 
+int WideGraph::fSpan()
+{
+  return ui->widePlot->fSpan ();
+}
+
 void WideGraph::setPeriod(int ntrperiod, int nsps)                  //SetPeriod
 {
   m_TRperiod=ntrperiod;
diff --git a/widegraph.h b/widegraph.h
index ba05d813c..3cfa6783f 100644
--- a/widegraph.h
+++ b/widegraph.h
@@ -29,6 +29,7 @@ public:
   int    nStartFreq();
   int    Fmin();
   int    Fmax();
+  int    fSpan();
   void   saveSettings();
   void   setRxRange(int fMin);
   void   setFsample(int n);