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One can also look at the various statistics for both Average RTT and losses , losses and minimum RTTs, see below (the spreadsheet is seen here). The Average and Losses are heavily influenced by the congestion. The minimum is mainly influenced by the route change or change in the distance of the cable route. Also note that the impact on the minimum RTT is not seen until Jan 17th since som oif January 16 measurements were made before the change of cables used.
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Traceroute
The route measured 19:00 hrs 1/28/2020 PST from SLAC to South Africa goes East across the US via Chicago, Washington to London and thence S. Africa:
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