[tor-talk] Cause of drops in network congestion on 2013-10-09 and 2014-06-06

[Virgil Griffith]

I've been looking through the various historical data from
metrics.torproject.org.

If you plot the 'used bandwidth' divided by the 'advertised bandwidth'
(meant to be a rough measure of network congestion), you get three distinct
groups, seen here:

http://dl.dropbox.com/u/3308162/three_groups.png
 What happened on the dates 2013-10-09 and 2014-06-06 which could have
resulted in these striking drops in network congestion?

-V