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There are two series in each graph, white balls represent the Correlation coefficient and red balls represent the number of target landmark available within radii of each landmark. Size of the ball represent the standard deviation of delay associated with each landmark and X-axis represents the ID of the landmark or simply the row number of spread sheet of raw data. You can find spread sheets of 1000KM_Radius and 25MS_Radius correlation_coefficient_1000km_radius.xlsx and Correlation_Coefficient_25MS_Radius.xlsx(25MS file has the column names). Left Y-axis is Correlation coefficient value and right Y-axis is number of landmarks within radii. As you can clearly see the trend of number of adjascent landmarks and correlation coefficient are both high for whole Europe but they are dispursed thourghout North America. These results contradicts the perception of very good connectivity inside North America. So, we decided to do further testing of this finding.
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