How is the number of slaves embarked and/or disembarked corresponding with different circle sizes computed?
A simple algorithm has been used to classify the number of embarkations and/or disembarkations for broad regions, regions, or ports, depending on the choice made in “Select map”, into five groups from smallest to largest. The map program looks for the place with the smallest and largest number of embarkations or disembarkations. The difference between the lowest and highest number is then divided by 5, to determine the range represented by each dot size.
