This document describes the Advanced Scientific Data Format (ASDF), pronounced AZ-diff. You can read the full specification at the online documentation.
This is the Advanced Scientific Data Format - if you are looking for the Adaptable Seismic Data Format, go here: http://seismic-data.org/
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Getting More Information
Greenfield, P., Droettboom, M., & Bray, E. (2015). ASDF: A new data format for astronomy. Astronomy and Computing, 12: 240-251. doi:10.1016/j.ascom.2015.06.004