Dear my colleagues, I am drawing US land surafce enery and water flux figure, and I can plot baisc energy and water fulx figs using R. Now I am adding US map (mainly boundary for US and boundary of 48 states) to my basic plot. Could you please tell me to how do it ( plaese give me an example R source code if it possible)? I am just a new begginer for R. Thanks,
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