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\end{figure}  We have cataloged 194 205  open-source packages for molecular modeling that provide a wide range of capabilities. As shown in Figure~\ref{licenses}, the most popular license (56\%) (55\%)  is some variant of the copyleft GNU Public License, which ensures that derivative works remain open source. Interestingly 78\% of the packages cataloged have a corresponding citeable publication which suggests that much of the software originates from academia. The distribution of average citations generated a year (as reported by Google Scholar) for the citeable publications is shown in Figure~\ref{cites}. A significant majority (84\%) of publications generate at least one citation a year, a quarter generate at least 10 citations, and 8\% generate more than 100 citations a year on average. A substantial portion of the packages cataloged are under active development and see significant usage, as shown in Figure~\ref{pies}. We rated 55\% of the packages as `A' level development, meaning major features or releases were made within the last 18 months, and 51\% see substantial usage (rank 1).   There a number of projects (31\%) where development has apparently ceased (no changes within the last 18 months). Note that our methodology for identifying packages