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\subsection{Visualization Of Software Tools Overlap}  \label{ssec:d3viz}  To facilitate undertanding of the highly multi-dimensional dataset of how use of the various software tools overlap with each other, we provide an interactive visualization, available by downloading the software repository described in Section \ref{sec:intro}, ordirectly  at \url{http://eteq.github.io/software_survey_analysis/software_tools_heirarchy_d3vis.html}. In this visualization, the tools respondents use are shown as sectors in a radial layout. Users of multiple tools are represented as stacked sectors: for example, the fraction of users who use only Python and IDL are represented as the fraction of the third ring with "Python" and "IDL" as the lower two layers. Hovering over that stack also shows the number of respondents to the left of the page (for Python and IDL only it is 36.) Clicking on a particular sector expands the visualization to show only those who use the corresponding stack of tools, and clicking on the central circle goes back to larger portions of the survey respondents.