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diff --git a/graphics/pgf/base/tex/generic/graphdrawing/lua/pgf/gd/doc/ogdf/misclayout/BalloonLayout.lua b/graphics/pgf/base/tex/generic/graphdrawing/lua/pgf/gd/doc/ogdf/misclayout/BalloonLayout.lua
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+++ b/graphics/pgf/base/tex/generic/graphdrawing/lua/pgf/gd/doc/ogdf/misclayout/BalloonLayout.lua
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+-- Copyright 2013 by Till Tantau
+--
+-- This file may be distributed an/or modified
+--
+-- 1. under the LaTeX Project Public License and/or
+-- 2. under the GNU Public License
+--
+-- See the file doc/generic/pgf/licenses/LICENSE for more information
+
+-- @release $Header$
+
+
+local key = require 'pgf.gd.doc'.key
+local documentation = require 'pgf.gd.doc'.documentation
+local summary = require 'pgf.gd.doc'.summary
+local example = require 'pgf.gd.doc'.example
+
+
+--------------------------------------------------------------------------------
+key "BalloonLayout"
+summary "A ``balloon layout''."
+
+documentation
+[[
+This algorithm computes a radial (balloon) layout based on a
+spanning tree. The algorithm is partially based on the paper
+\emph{On Balloon Drawings of Rooted Trees} by Lin and Yen and on
+\emph{Interacting with Huge Hierarchies: Beyond Cone Trees} by
+Carriere and Kazman.
+]]
+
+example
+[[
+\tikz \graph [BalloonLayout] { a -- {b,c,d -- {e,f,h,h,i}, j -- k -- {l,m,n}} };
+]]
+--------------------------------------------------------------------------------
+
+
+
+--------------------------------------------------------------------------------
+key "BalloonLayout.evenAngles"
+summary "Subtrees may be assigned even angles or angles depending on their size."
+--------------------------------------------------------------------------------
+
+
+-- Local Variables:
+-- mode:latex
+-- End: \ No newline at end of file