There is a dead link under the plotHeatmap tool.
Under : Color map to use for the heatmap Available color map names can be found here: http://www.astro.lsa.umich.edu/~msshin/science/code/matplotlib_cm/
This link gives a "no longer maintained" message and redirects to: http://www2.physics.ox.ac.uk/users/msshin/science/code/matplotlib_cm
which doesn't exist.