\label{ssec:d3viz}
To facilitate understanding of this multi-dimensional dataset of how use of the various software tools overlap with each other, we provide an interactive visualization, available within the Authorea version of the paper, by downloading the software repository described in Section \ref{sec:intro}, or at this link. 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 labeled “idl” with “python” and “idl” as the lower two layers. Hovering over that sector 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, while clicking on the central circle goes back to larger segments of the survey.