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

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