Logo of the data analysis software BlueSky, as in use 2023, first appeared in 2015 <a rel="nofollow" class="external free" href="https://web.archive.org/web/20150912025519/http://www.blueskystatistics.com/">https://web.archive.org/web/20150912025519/http://www.blueskystatistics.com/</a>
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