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PingER NDT vs.  Ookla speedtest transfer rate

ZDnet Speedtest vs Ookla Speedtest

ZDnet speedtest vs PingER  NDT

For further validation see Throughput versus Loss where a correlation of R^2 ~ 0.85 is obtained for Derived ping throughputs versus actual throughputs measured beween GSFC and LANL  by Andy Germain in 1999.