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+Copyright (C) 2015
+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 1991-1997 by Bell Labs Innovations for Lucent Technologies.
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided
+that the above copyright notice appear in all copies and that both that the
+copyright notice and warranty disclaimer appear in supporting documentation,
+and that the names of Lucent Technologies any of their entities not be used
+in advertising or publicity pertaining to distribution of the software
+without specific, written prior permission.
+
+Lucent Technologies disclaims all warranties with regard to this software,
+including all implied warranties of merchantability and fitness.  In no event
+shall Lucent Technologies be liable for any special, indirect or
+consequential damages or any damages whatsoever resulting from loss of use,
+data or profits, whether in an action of contract, negligence or other
+tortuous action, arising out of or in connection with the use or performance
+of this software.  
+
+Introduction to the tkblt library
+
+tkblt is a library of extensions to the Tk library.  It adds new
+commands and variables to the application's interpreter.
+
+The following commands are added to the interpreter from the BLT library:
+
+graph
+A 2D plotting widget.  Plots two variable data in a window with an optional 
+legend and annotations.   It has of several components; coordinate axes, 
+crosshairs, a legend, and a collection of elements and tags.
+
+barchart
+A barchart widget.  Plots two-variable data as rectangular bars in a 
+window.  The x-coordinate values designate the position of the bar along 
+the x-axis, while the y-coordinate values designate the magnitude.
+The barchart widget has of several components; coordinate axes, 
+crosshairs, a legend, and a collection of elements and tags.
+
+vector 
+Creates a vector of floating point values.  The vector's components
+can be manipulated in three ways: through a Tcl array variable, a Tcl
+command, or the C API.
+
+Send bug reports, requests, suggestions, etc. to 
+
+wjoye@cfa.harvard.edu
+