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\subsection{Box 6: Journal Policies}  Sharing data, code, and other materials is quickly moving from ``desired'' to ``required''.  For example, PLOS's sharing policy\footnote{\url{http://journals.plos.org/plosone/s/materials-and-software-sharing}} policy (\href{http://journals.plos.org/plosone/s/materials-and-software-sharing}{journals.plos.org/plosone/s/materials-and-software-sharing})  already says, ``We expect that all researchers submitting to PLOS will make all relevant materials that may be reasonably requested by others available without restrictions upon publication of the work.''  Its policy on software is more specific: