diff --git a/lib/Plot.cpp b/lib/Plot.cpp
index 24e0a2a..7191bae 100644
--- a/lib/Plot.cpp
+++ b/lib/Plot.cpp
@@ -33,11 +33,21 @@ const string & PlotObject::getCommand(void) const
     return command_;
 }
 
+const string & PlotObject::getHeadCommand(void) const
+{
+    return headCommand_;
+}
+
 void PlotObject::setCommand(const string &command)
 {
     command_ = command;
 }
 
+void PlotObject::setHeadCommand(const string &command)
+{
+    headCommand_ = command;
+}
+
 string PlotObject::popTmpFile(void)
 {
     string res = tmpFileName_.top();
@@ -95,6 +105,12 @@ PlotCommand::PlotCommand(const string &command)
     setCommand(command);
 }
 
+// PlotHeadCommand constructor /////////////////////////////////////////////////
+PlotHeadCommand::PlotHeadCommand(const string &command)
+{
+    setHeadCommand(command);
+}
+
 // PlotData constructor ////////////////////////////////////////////////////////
 PlotData::PlotData(const XYStatData &data, const Index i, const Index j)
 {
@@ -311,21 +327,28 @@ Plot & Plot::operator<<(PlotObject &&command)
         commandStr += "'" + tmpFileName_.back() + "' ";
     }
     commandStr = command.getCommand();
-    if (!options_.lineColor.empty())
+    if (!commandStr.empty())
     {
-        commandStr         += " lc " + options_.lineColor;
-        options_.lineColor  = "";
+        if (!options_.lineColor.empty())
+        {
+            commandStr         += " lc " + options_.lineColor;
+            options_.lineColor  = "";
+        }
+        if (options_.title.empty())
+        {
+            commandStr += " notitle";
+        }
+        else
+        {
+            commandStr     += " t '" + options_.title + "'";
+            options_.title  = "";
+        }
+        plotCommand_.push_back(commandStr);
     }
-    if (options_.title.empty())
+    if (!command.getHeadCommand().empty())
     {
-        commandStr += " notitle";
+        headCommand_.push_back(command.getHeadCommand());
     }
-    else
-    {
-        commandStr     += " t '" + options_.title + "'";
-        options_.title  = "";
-    }
-    plotCommand_.push_back(commandStr);
     
     return *this;
 }
diff --git a/lib/Plot.hpp b/lib/Plot.hpp
index 51ae41d..f4b44f1 100644
--- a/lib/Plot.hpp
+++ b/lib/Plot.hpp
@@ -48,17 +48,20 @@ public:
     // access
     std::string                 popTmpFile(void);
     const std::string &         getCommand(void) const;
+    const std::string &         getHeadCommand(void) const;
     // test
     bool                        gotTmpFile(void) const;
 protected:
     // access
     void pushTmpFile(const std::string &fileName);
     void setCommand(const std::string &command);
+    void setHeadCommand(const std::string &command);
     // dump a matrix to a temporary file
     std::string dumpToTmpFile(const DMat &m);
 private:
     // plot command
     std::string command_;
+    std::string headCommand_;
     // stack of created temporary files
     std::stack<std::string>  tmpFileName_;
 };
@@ -72,6 +75,15 @@ public:
     virtual ~PlotCommand(void) = default;
 };
 
+class PlotHeadCommand: public PlotObject
+{
+public:
+    // constructor
+    explicit PlotHeadCommand(const std::string &command);
+    // destructor
+    virtual ~PlotHeadCommand(void) = default;
+};
+
 class PlotData: public PlotObject
 {
 public: