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fbiga
Hello, I faced the same issue. Here's the way to add a legend. You first need to create a d3.js code and store in the working directory. This d3.js code...
Here is a gist with a couple of functions which load faostat bulk data into R data frames: https://gist.github.com/fbiga/0f94080bc9e645184a4368639b81d35a