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The median value of alpha from England(Warrington) to Europe is 40.71 (km/ms). The IQR is 15.6 (km/ms) or IQR/Median~ 38% or ~ +-19%. The highest value of alpha 97.72 (km/ms) is due to a very small RTT (2.6ms) between (demon.co.uk) and this landmark which are 263 km apart.
The graph below shows the alpha distribution as seen from Italy to other European countries.
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The median value of alpha from ICTP (Italy) to Europe is 18.91 (km/ms). The IQR is 10.98 (km/ms) or IQR/Median is ~58% or ~+-29.5%.
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Conclusions
- Tiering can be used in N. America and Europe.
- The Great Circle distance and the path which the packets fallow may be different.
References
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\[1\] A region may be different then a geographical region |