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\section*{OSI \section*{Two new altmetrics for Open Science: OSI  and COSI} \textbf{We introduce two new altmetrics that measure the degree of openness and collaboration of scholars and institutions. The Open Science Index (OSI) and the Collaborative Open Science Index (COSI). }  \begin{itemize}  \item \textbf{OSI: the fraction of articles written in the open.} A scholar has OSI of 50\% if half of their articles are private. Similarly, an institution has an OSI of 70\% if 7 out of 10 articles authored by affiliated scholars are open.