\section{Additional information}
\subsection{Software access}
A first version of the software used here can be downloaded through the following means.
In a conda environment do: "conda install -c georgedimitriadis t{\_}sne{\_}bhcuda". That will install both the python code and the cuda executable and will work in either Windows or Linux OSes.
You can grab the python code from the pypi repository: 
\\ \href{https://pypi.python.org/pypi/t_sne_bhcuda/0.2.1}{https://pypi.python.org/pypi/t{\_}sne{\_}bhcuda/0.2.1}.
\\You can get the C / CUDA code for the cuda executable from the github repository: 
\\ \href{https://github.com/georgedimitriadis/t_sne_bhcuda}{https://github.com/georgedimitriadis/t{\_}sne{\_}bhcuda}.
\\We are currently in the process of re-writing the code so that the cuda part is embedded in the python code. For this and future developments check the pypi and github repositories or contact the authors.

\subsection{Competing interests}
The authors declare no competing financial interests