Readers can determine a concept in a graph by interpreting it based on its legends and data.
To interpret data from a graph, you must first read the legends. This is because they inform the subject covered by the graph and this will make it easier for you to understand it.
Then you should observe the relationship between the values shown in the graph, according to the geographical shapes presented in it.
You didn't show the graph this question is related to. This prevents you from getting an exact answer, but I hope this information can help you.
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