What: We created the above legend using graphics instead of creating legend element, which could not support the precise style we wanted for this legend. Why: A graduated symbol legend should, if possible, relate very directly to the map. Thus, the way the symbols superimpose and the sizes of the symbols is important. To aid readers of this map in interpretting the size of the graduated symbols, the legend depicts the largest, the smallest, and a representative middle values. In this map, we felt including the graph at the lower right also provides the values for the symbols, which helps ensure map reading errors are minimized.
How: On the map the smaller orbs were superimposed in front of the large orbs by converting the layer to graphics. Those graphics are stored in annotation groups in the data frame; this strategy created one big advantage for creating this legend: the graphics we needed for the legend could be selected in the map, copied, and then pasted in the layout.
To create this graphic legend, you should be working in ArcMap in layout view, and then follow these steps
Use the graphics toolbar, which contains tools for front to back ordering to superimpose the symbols.
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