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diff --git a/src/bltGraphBar.h b/src/bltGraphBar.h
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+++ b/src/bltGraphBar.h
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+/*
+ * Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+ * This code has been modified under the terms listed below and is made
+ * available under the same terms.
+ */
+
+/*
+ *	Copyright 1993-2004 George A Howlett.
+ *
+ *	Permission is hereby granted, free of charge, to any person obtaining
+ *	a copy of this software and associated documentation files (the
+ *	"Software"), to deal in the Software without restriction, including
+ *	without limitation the rights to use, copy, modify, merge, publish,
+ *	distribute, sublicense, and/or sell copies of the Software, and to
+ *	permit persons to whom the Software is furnished to do so, subject to
+ *	the following conditions:
+ *
+ *	The above copyright notice and this permission notice shall be
+ *	included in all copies or substantial portions of the Software.
+ *
+ *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *	NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *	LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *	OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __BltGraphBar_h__
+#define __BltGraphBar_h__
+
+extern "C" {
+#include "bltGraph.h"
+};
+
+typedef struct {
+  int nSegments;
+  Axis2d axes;
+  float sum;
+  int count;
+  float lastY;
+  size_t index;
+} BarGroup;
+
+typedef struct {
+  float value;
+  Axis2d axes;
+} BarSetKey;
+
+typedef enum {
+  BARS_INFRONT, BARS_STACKED, BARS_ALIGNED, BARS_OVERLAP
+} BarMode;
+
+typedef struct {
+  double aspect;
+  Tk_3DBorder normalBg;
+  int borderWidth;
+  Margin margins[4];
+  int backingStore;
+  int doubleBuffer;
+  Tk_Cursor cursor;
+  TextStyle titleTextStyle;
+  int reqHeight;
+  XColor* highlightBgColor;
+  XColor* highlightColor;
+  int highlightWidth;
+  int inverted;
+  Tk_3DBorder plotBg;
+  int plotBW;
+  int xPad;
+  int yPad;
+  int plotRelief;
+  int relief;
+  ClosestSearch search;
+  int stackAxes;
+  const char *takeFocus; // nor used in C code
+  const char *title;
+  int reqWidth;
+  int reqPlotWidth;
+  int reqPlotHeight;
+
+  // bar graph
+  BarMode barMode;
+  double barWidth;
+  double baseline;
+} BarGraphOptions;
+
+class BarGraph : public Graph {
+ public:
+  BarGroup *barGroups_;
+  int nBarGroups_;
+  Tcl_HashTable setTable_;
+  int maxBarSetSize_;
+
+ protected:
+  void resetAxes();
+  void mapElements();
+
+ public:
+  BarGraph(ClientData, Tcl_Interp*, int, Tcl_Obj* const []);
+  virtual ~BarGraph();
+
+  void configure();
+  int createPen(const char*, int, Tcl_Obj* const []);
+  int createElement(int, Tcl_Obj* const []);
+
+};
+
+#endif