The figures represent percentage availability, i.e. 1 means the path should be open between 1 and 19% of days, 2 means the path should be open between 20 and 29% of days, etc. The colours represent expected signal strength, i.e. Black = low to very low signals, Blue = fair signals and Red = strong signals.
Click on the Pictures for a clearer view.(RSGB)
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