Tor version 0.2.4 and Other versions have the same color
Reported by ahf in #tor-dev on February 19, 2016. Example: https://metrics.torproject.org/versions.html
Possible fix could be to use gray for Other, because that line is always in the graph, and keep using colors for actual versions.
Another alternative could be to switch to a faceted plot with multiple time plots beneath each other. That would make it a bit harder to compare absolute numbers, but it would also remove the problem of colors behind difficult to distinguish.
Or maybe there are even smarter visualizations available?