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/usr/share/plplot_octave/top_title.m is in octave-plplot 5.9.9-2ubuntu2.

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## Copyright (C) 1998-2003 Joao Cardoso.
## 
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by the
## Free Software Foundation; either version 2 of the License, or (at your
## option) any later version.
## 
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## This file is part of plplot_octave.

## FIXME: in subplot mode, can't write at TOP of figure

function top_title
  warning("top_title: in subplot mode, PLplot can't write at TOP of figure");
endfunction