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On Aug 1, 2009 at about 23:00 hours GMT the RTTs averaged over a day, from SLAC to www.ternet.or.tz ch changed from about 730ms to about 350ms, see below:
However after a day or so the RTT reverted back to the former value. A traceroute when the RTTs were long shows the route going via Telia and the Newskies satellite network.