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2$\begingroup$ The first link in the quote leads to a 404 error page. $\endgroup$– PhilippCommented Dec 12, 2016 at 19:49
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$\begingroup$ @Philipp: 2016-12-12 19:51:50 here it is just veeeery slow to load, but it finally works. $\endgroup$– AlexPCommented Dec 12, 2016 at 19:53
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$\begingroup$ @AlexP are you behind a university firewall? $\endgroup$– TimCommented Dec 13, 2016 at 23:13
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1$\begingroup$ @Tim: No, not a university firewall. $\endgroup$– AlexPCommented Dec 13, 2016 at 23:39
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$\begingroup$ There is also issue of photopic vs scotopic vision which means that very dim light sources cannot have color at all. Starry sky falls under mesopic (mixed) vision but it means that color discrimination is already impaired. $\endgroup$– Agent_LCommented Dec 15, 2016 at 15:22
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