\ch{Graph source code}

This appendix contains all of the source code for the various graphs
throughout the book.

\lstinputlisting[style=sage, caption={This program puts a few points on
  a Cartesian coordinate plane.}, label={src:vg2}]{VectorGraph2.sage}

\lstinputlisting[style=sage, caption={Produces a number of graphs
  corresponding to $\ld x x^2$}, label={src:x-squared}]{x-squared.sage}
