These example Python programs are distributed as part of the PythTB
package.  PythTB 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 3 of
the License, or (at your option) any later version.

PythTB 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.

A copy of the GNU General Public License should be available
alongside the source in a file named gpl-3.0.txt.  If not,
see <http://www.gnu.org/licenses/>.

PythTB is availabe at http://www.physics.rutgers.edu/pythtb/
