Dear List,
I am using the command plot to present the relationship between bird richness (Y axis) and elevation (X axis). However, I would like to observe the distributions of bird richness in different administrative areas (A, B, C, ., G) in this plot. For example, the dots in area A might fall in the upper right part of the plot, while those in area B might appear in the middle of the elevation range. Please kindly advise how to differentiate the dots in distinct areas using colors. Thank you. Elaine [[alternative HTML version deleted]]
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